Answer: see proof below
Step-by-step explanation:
Use the Cofunction Identity: sin (90 - A) = cos (A)
Use the Double Angle Identity: sin(2A) = 2 sinA cosA
Use the Triple Angle Identity: cos (3A) = 4cos³A - 3cosA
Use the Zero Product Property: If a · b = 0, then a = 0 or b = 0
Use Pythagorean Identity: cos²A + sin²A = 1 → cos²A = 1 - sin²A
Use Quadratic Formula: [tex]x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}[/tex]
Proof LHS → RHS:
Assumption: Let A = 18°
Multiplication: then 5A = 5(18°)
→ 5A = 90°
Expand: 2A + 3A = 90°
→ 2A = 90° - 3A
Apply sin: sin (2A) = sin (90° - 3A)
Cofunction: sin (2A) = cos (3A)
Double Angle: 2 sinA cos A = cos (3A)
Triple Angle: 2 sin A cos A = 4cos³A - 3cos A
→ -4cos³A + 3cos A + 2sinA cos A = 0
Factor: cos A(-4cos² A + 3 + 2sin A) = 0
Zero Product Property: cos A = 0 or -4cos² A + 3 + 2sin A = 0
↓
Disregard (since cos A ≠ 0)
Pythagorean: -4cos² A + 3 + 2sin A = 0
→ -4(1 - sin² A) + 3 + 2sin A = 0
→ -4 + 4sin² A + 3 + 2sin A = 0
Simplify: 4sin² A + 2sin A - 1 = 0
a=4 b=2 c= -1
[tex]\text{Quadratic Formula:}\qquad \sin A=\dfrac{-(2)\pm \sqrt{2^2-4(4)(-1)}}{2(4)}[/tex]
[tex]=\dfrac{-2\pm \sqrt{4+16}}{8}[/tex]
[tex]=\dfrac{-2\pm \sqrt{20}}{8}[/tex]
[tex]=\dfrac{-2\pm 2\sqrt{5}}{2(4)}[/tex]
[tex]=\dfrac{-1\pm \sqrt{5}}{4}[/tex]
[tex]=\dfrac{ \sqrt{5}-1}{4}[/tex]
[tex]\text{Substitute A = 18:}\qquad \sin 18=\dfrac{ \sqrt{5}-1}{4}[/tex]
The first term of a sequence is 2, the third term is 18, and the fifth term is 162. What is
the second term of the sequence?
Answer:
[tex]a_2=6[/tex]
Step-by-step explanation:
Geometric sequence general formula: [tex]a_n=ar^{n-1}[/tex]
Given:
[tex]a_1=2[/tex][tex]a_3=18[/tex][tex]a_5=162[/tex]Therefore,
[tex]a_1=2 \implies a=2[/tex]
[tex]a_3=2 \cdot r^2=18[/tex]
[tex]a_5=2 \cdot r^4=162[/tex]
To find common ratio r, divide 5th and 3rd terms:
[tex]\dfrac{a_5}{a_3}=\dfrac{2 \cdot r^4}{2 \cdot r^2}=\dfrac{162}{18}[/tex]
[tex]\implies r^2=9[/tex]
[tex]\implies r=\sqrt{9}=3[/tex]
Therefore, geometric sequence formula: [tex]a_n=2 \cdot 9^{n-1}[/tex]
So second term of sequence:
[tex]\implies a_2=2 \cdot 3^{2-1}=6[/tex]
Kate took out a subsidized stafford loan worth $9,710 to pay for college. the interest rate on the loan was 5.9%, compounded monthly. it took kate 5 years to pay off the loan after graduation. what portion of the total amount she paid represented the interest? a. $11,236.22 b. $9,710.00 c. $1,526.22 d. $2,942.37
The total amount paid by Kate as a portion of interest will be $12932.
What will be the Compound interest?The compound interest is the interest levied upon both the principal amount and the interest from the previous periods.
The formula for the calculation of the compound interest will be given as
[tex]A=P(1+\dfrac{r}{100^} )^n[/tex]
here,
A= Amount
P= priciple
r=Rate of interest
n=Time period
Now it is given that,
P=$9710
r=5.9%
n=5
Then putting the values in the formula we get
[tex]A=9710(1+\dfrac{5.9}{100})^5[/tex]
A=$12932
Hence the total amount paid by Kate as a portion of interest will be $12932.
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Answer:
the answer is C 1,526.22
Step-by-step explanation
2022 edge test
Find the value of x.
5x (x+24)
Answer:
5x^2+120x
Step-by-step explanation:
5x(x+24)
Step 1: Use distributive property to expand the expression. Multiply 5x separately with all the terms inside the bracket.
Step 2: 5x(x) = 5x^2
5x(24) = 120x
Answer: 5x^2+120x
Note: If you need to further solve it, you can factor it.
To Factor;
5x^2+120x
Step 1: Factor out the common: 5x
Step 2: 5x times x = x^2
5x times 24 = 120x
Therefore,
Factored answer: 5x(x+24)
Hope this helps.
Answer:x=6
Step-by-step explanation:
5x(x+24)=0
5x = x +24
5x - x = x - x + 24
4x = 24
X = 24/4
X = 6
Help help:(:(:(:(:(:(:(
Answer:
are they talking bout how much will you have left then its 0 if they talking but the check its positive
What are the values of the trigonometric ratios for this triangle?
Drag the answer into the box to match each ratio.
Answer:
sin = o/h = 5/13
cos = a/h = 12/13
tan = o/a = 5/12
o - opposite
a- adjacent
h - hypotenuse
Use distributive property to factor method 1. Use distributive property to expand method 2.
Step-by-step explanation:
I guess method 1 means to deal with whole factors.
x + 5 = (x - 2)(x + 5)
for (x + 5) <> 0 we can divide both sides by this factor :
1 = x - 2
x = 3
for the second solution we deal with
x + 5 = 0
x = -5
so, for x = -5 and x = 3 both functions deliver the same output, and these are the intersection points.
method 2 : we multiply the expression out and solve it then
x + 5 = (x - 2)(x + 5)
x + 5 = x² + 5x - 2x - 10 = x² + 3x - 10
0 = x² + 2x - 15
the general solution to such a square equation is
x = (-b ± sqrt(b² - 4ac))/(2a)
in our case
a = 1
b = 2
c = -15
x = (-2 ± sqrt(2² - 4×1×-15))/(2×1) =
= (-2 ± sqrt(4 + 60))/2 = (-2 ± sqrt(64))/2 = (-2 ± 8)/2 =
= -1 ± 4
x1 = -1 + 4 = 3
x2 = -1 - 4 = -5
and you get the 2 solutions again. as expected, they are the same as with method 1, of course.
Evaluate the expression? 2⁵
Answer:
10
Step-by-step explanation: You would have to multiply 2 by itself 50 times.
The value of the given expression is 32.
What is expression?Mathematical expressions consist of at least two numbers or variables, at least one arithmetic operation, and a statement. It's possible to multiply, divide, add, or subtract with this mathematical operation.
Given an expression 2⁵
Evaluate using the Power rule:
mⁿ = m *m* m* m* m*m.......n times
Thus, the Value of the expression 2⁵ will be:
2⁵ = 2 * 2 * 2 * 2 * 2
2⁵ = 32
Therefore, The value of the given expression is 32.
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Price is $79.99 sales tax is 5.5% what is the total cost
Answer:
$84.38
Step-by-step explanation:
i did 5.5% of 79.99=4.39
79.99+4.39=84.38
Find m
Round to the nearest degree.
14
13
5
В
Answer: 21
Step-by-step explanation:
Find the area of the shape. Either enter an exact answer in terms of pi or use 3.14 for pi and enter your answer as a decimal. PLSS HELP!
[tex] \alpha = \frac{3\pi}{4} r {}^{2}[/tex]
[tex] \alpha = \frac{3 \times 3.14}{4} \times (2) {}^{2} [/tex]
[tex] \alpha = 9.42[/tex]
Normally the area would be given by a=πr², but since we have three quarters of a circle, we can just say a=3π/4 (r)²Area=3π if you want it in radians :)
can anyone help ?????
Answer:
a), b) and c) are correct.
d) 12g^4h^5
Step-by-step explanation:
What is the common difference in this sequence?
{48, 32, 16, 0, ... }
Answer:
The common difference in this sequence is 16
Step-by-step explanation:
9x-3y=42
-9x+8y=22
i need help with this fast pls help me
10 pts. for whoever solves this!
Answer:
x = 4
Step-by-step explanation:
the segment inside the triangle is an angle bisector and divide the opposite side into segments that are proportional to the other two sides, that is
[tex]\frac{x}{x+4}[/tex] = [tex]\frac{x+6}{2x+12}[/tex] = [tex]\frac{x+6}{2(x+6)}[/tex] = [tex]\frac{1}{2}[/tex] ( cross- multiply )
2x = x + 4 ( subtract x from both sides )
x = 4
pls help, i don’t understand this at alll !!!!!
Answer:
A. 720
B. 120
Step-by-step explanation:
To do this you need to do permutation with your calculator
A.
KINDLY has 6 letters
an easy way to do this is by
6 x 5 x 4 x 3 x 2 x 1 = 720
or 6! = 720
B.
6 nPr 3 = 120
or
n! 6! 6 x 5 x 4 x 3 x 2 x 1 720
P(n, r) = -------- = ---------- = ------------------------------- = ----------- = 120
(n - r)! (6 - 3)! 3 x 2 x 1 6
I hope this helps!
pls help
solve for x 10.2 , 6.8
Answer: 13.8
Step-by-step explanation:
Answer:
13.8
Step-by-step explanation:
Is there any trinomial antonyms.
(Round answer to the nearest tenth and use n=3.14) finding circumference (know the radius is 21ft) wha the circumference of the circle??
Answer:
66cm
Step-by-step explanation:
i kniw
I will mark brainliest for the first person to answer my question
Answer:
The correct answer is 360 - 150 = x
HEEEEELLLLPP
What is the measure of <6
5 ori 5 fac 25 și cu 25 egal 14 și cu 14 egal 100 și cu 100 egal 12
Step-by-step explanation:
sper ca team ajutat
Answer:
∠ 6 = 45°
Step-by-step explanation:
∠ 6 and 45° are vertically opposite angles and are congruent , so
∠ 6 = 45°
Let f(x) = -2x +49 and g(x) = -4x + 3. Find
(fºg)(-5).
Answer:
3 i think
Step-by-step explanation:
so we substitute -5 to g(x)
g(x) = -4(-5) + 3
= 20 + 3
= 23
now we substitute it to f(x)
f(x) = -2x + 49
= -2(23) + 49
= -46 + 49
= 3
Answer:
3
Step-by-step explanation:
f(x) = -2x + 49
g(x) = -4x + 3
(fºg)(x) = f(g(x)) = -2(-4x + 3) + 49
(fºg)(x) = 8x - 6 + 49
(fºg)(x) = 8x + 43
(fºg)(-5) = 8(-5) + 43
(fºg)(-5) = 3
.
Let f(x)=x-5 and g(x)=x^2-7x+8 find f(x) × g(x)
Answer:
x³ - 12x² + 43x - 40
Step-by-step explanation:
f(x) × g(x)
= (x - 5)(x² - 7x + 8)
Each term in the second factor is multiplied by each term in the first factor, that is
x(x² - 7x + 8) - 5(x² - 7x + 8) ← distribute both parenthesis
= x³ - 7x² + 8x - 5x² + 35x - 40 ← collect like terms
= x³ - 12x² + 43x - 40
PLEASE HELP QUICKLY: (FIRST ANSWER GETS BRAINLIEST)
ou are buying batteries, a stereo, and some CDs from the I.B. Electronics store. You can buy from this store online or in a physical store. You have a coupon for 10% off that can only be used in the physical store and a $5.00 off coupon that can only be used online. The sales tax of 5% only applies to the physical store. Shipping for the online store is a flat rate of $6.99. You are trying to decide whether to shop at the physical store or the online store. Using the pricing information below, determine which store would cost less after all discounts, taxes, and shipping fees have been applied.
Item Quantity Physical Store Online Store
Batteries 2 packs $5.99/pack $4.99/pack
Stero 1 system $100.00/system $90.00/system
CDs 3 CDs $7.95/CD $8.95/CD
There is not enough information given.
It would cost less to purchase the items from the physical store.
It would cost less to purchase the items from the online store.
Answer:
It would be cheaper to use the online store
Step-by-step explanation:
the physical store added up to $129.04 and the online store was $128.82.
It would cost less to purchase the items from the physical store.
The correct option is C.
What is a percentage?A ratio or value that may be stated as a fraction of 100 is called a percentage. Moreover, it is indicated by the symbol "%."
To calculate the total cost for each store, we need to take into account the discounts, taxes, and shipping fees.
For the physical store:
Batteries: 2 packs x $5.99/pack = $11.98
Stereo: 1 system x $100.00/system = $100.00
CDs: 3 CDs x $7.95/CD = $23.85
Subtotal: $135.83
After the 10% discount: $135.83 - 10% = $122.25
Sales tax: $122.25 x 5% = $6.11
Total cost: $122.25 + $6.11 = $128.36
For the online store:
Batteries: 2 packs x $4.99/pack = $9.98
Stereo: 1 system x $90.00/system = $90.00
CDs: 3 CDs x $8.95/CD = $26.85
Subtotal: $126.83
After the $5.00 discount: $126.83 - $5.00 = $121.83
Shipping fee: $6.99
Total cost: $121.83 + $6.99 = $128.82
Therefore, it would cost less to purchase the items from the physical store.
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Lenny has a job that pays $8 per hour plus tips (t). Lenny worked for 4 hours Monday and made $65 in all. Which equation could be used to find t, the amount Lenny made in tips?
Answer:
t= 33
Step-by-step explanation:
4(8) +t = 65
32+t=65
t=33
Hope this helps!
Step-by-step explanation:
T = hourly pay (8$)
Y = hours worked
T • Y = 32
65-32 = 33$ in tips
find missing side lengths pls help me lol!!!! marking brainliest and i need to show work
Answer:
x=14
y=7
Step-by-step explanation:
this is a 30-60-90 triangle -- u can tell bc there is a right angle marker (90 degrees) and one angle is 30, so the other angle is 60
in a 30-60-90 triangle,,
the long leg = x√3
short leg = x
hypotenuse (the side opposite the right angle marker) = 2x
since u know the long leg is 7√3, the short leg = 7
and since the hypotenuse is 2x (twice the short leg), 7 times 2 = 14
Are the ratios 1:2 and 9:18 equivalent?
Answer:
Yes! Because they are in proportion: 1x9 = 9, 2x9 = 18 therefore, 1:2 and 9:18 are equivalent. Similar to equivalent fractions - you need to multiply both numbers by the same number. Hope this helped!
Step-by-step explanation:
If you need further help, let me know!
- profparis
The points A,B and C lie on a straight line
The coordinates of A are (9,0)
The coordinates of B are (7,4)
The coordinates of C are (1,q)
Work out the value of q
The value of q is 16.
What are Collinear Points?Collinear points are the points which are formed on a straight line, whether they are close or far away.
If three or more points are collinear, then they form on the same line.
The slope of each pair of points will be same.
Here if A, B and C are collinear,
Slope of AB = Slope of BC
(4 - 0) / (7 - 9) = (q - 4) / (1 - 7)
-2 = (q - 4) / -6
q - 4 = 12
q = 16
Hence the value of q is 16.
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88-BC43) Bacteria in a certain culture increase at a rate proportional to the number present. If the number of bacteria doubles in three hours, in how many hours will the number of bacteria triple
Answer:
You times them, its easy.
Step-by-step explanation:
1 times 2 times 3, it will multiply in 6 hours
WILL GIVE BRAINLIEST!!!
(06.02 MC)
A scatter plot with a line is shown:
Which statement is most likely correct about the line? (5 points)
It can be a line of best fit because it passes through all the data points
It can be a line of best fit because it is close to most data points
it cannot be a line of best fit because it does not pass through all the points.
it cannot be a line of best fit because it does not pass through the first and last points
Answer: The answer is B:)))
Step-by-step explanation:
It can be the line of best fit because it is close to most data points.
Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.
Answer: The answer is 3211000 :^
Step-by-step explanation: hope this helps