Answer:
log ( 100 )
6 !
3 !
log ( 7 )
Iron(II) sulfide has a molar mass of 87. 91 g/mol. 50 grams of this substance would contain about 3. 011 x 1023 molecules.
true or false?
Answer:
False
Step-by-step explanation:
The number of molecules in a mole of any substance is Avogadro's number, 6.022×10^23. The number of moles of a substance is the mass of it divided by the mass per mole. Here, we expect the number of molecules to be about ...
(6.022×10^23 molecules/mole) × (50 g)/(87.91 g/mole)
≈ 3.425×10^23 molecules
__
The suggested number is approximately 12% low, too far off to be considered "about" correct. The offered statement is FALSE.
Write an algebraic expression for 11 times the quantity 16 less than a number d
Answer:
d - 11*16
Step-by-step explanation:
Algebraic Expressions
We use algebraic expressions to model real-world situations and we must pay close attention to the writing of the problem to do it properly and accurately.
Let's build the expression in small steps:
11 times the quantity 16 = 11*16
That amount less than a number d. It suggests a subtraction:
d - 11*16
a railroad crew can replace 400 meters of rail in 5 days. How many kilometers can they replace in 20 days?
Answer: 1.6 km
Step-by-step explanation:
If they can replace 400 meters in 5 days, that means they can replace 80 meters in 1 day, (400/5). So in 20 days, they will do 20x80 = 1600 meters. Since 1000 meters make one km, 1600/1000 = 1.6 km in 20 days
NEED HELP ASAP PLS!
Answer:
5x² + 5x + 9
Step-by-step explanation:
(3x + 4) + ((5x² - 1) + (2x + 6))
Remove parenthesis
3x + 4 + 5x² - 1 + 2x + 6
Group like terms
5x² + 3x + 2x + 4 - 1 + 6
Subtract 1 from 4
5x² + 3x + 2x + 3 + 6
Add 3 and 6
5x² + 3x + 2x + 9
Combine like terms
5x² + 5x + 9
Answer: 5x² + 5x + 9
You poured some 6% alcohol solution and some 8% alcohol solution into a mixing container. Now you have 600 grams of 7.4% alcohol solution. Write and solve a system of equations to find how many grams of 6% solution and how many grams of 8% solution you poured into the mixing container.
You mixed ___ grams of 6% solution with ____grams of 8% solution.
Answer:
180 grams of 6%420 grams of 8%Step-by-step explanation:
Let s and e represent the grams of 6% and 8% solution, respectively. The given relations can be described by ...
s + e = 600 . . . . . you have 600 grams of mixture
0.06s +0.08e = 0.074(600) . . . . grams of alcohol in the mixture
__
The first equation can give an expression for s that substitutes nicely into the second equation:
s = 600 -e
0.06(600 -e) +0.08e = 0.074(600) . . . . substitute for s
0.02e = 0.014(600) . . . . . . subtract 0.06(600)
e = 420 . . . . . . . divide by 0.02
s = 600 -420 = 180
You mixed 180 grams of 6% solution with 420 grams of 8% solution.
Answer: 180 grams of 6% solution with 420 grams of 8% solution.
Step-by-step explanation:
Let x and y be the weight (in grams) of 6% and 8% alcohol solution. Since the total weight is 600 grams, therefore,
[tex]$$\Rightarrow x+y=600 \ldots \text { (1) }[/tex]
Using the statement given, we can write the following equation:
[tex]\Rightarrow 6 x+8 y=(7.4)(600)\\ \Rightarrow 6 x+8 y=4440 \text {... (2) }[/tex]
Substitute the value of y from equation (1) into equation (2), we'll get:
[tex]\begin{gathered}\Rightarrow 6 x+8(600-x)=4440 \\\Rightarrow 6 x+4800-8 x=4440 \\\Rightarrow 2 x=360 \\\Rightarrow x=180\end{gathered}[/tex]
Therefore,
[tex]\Rightarrow y=600-180=420[/tex]
Therefore, you mixed 180 grams of 6% solution with 420 grams of 8% solution.
A pilot was scheduled to depart at 4:00 pm, but due to air traffic, her departure has been delayed by 10 minutes. Air traffic control approved a new flight plan that will allow her to arrive three times faster than she calculated in her original flight plan. Let x represent the time, in minutes, of her original flight. Create an equation that can be used to predict the number of minutes after 4:00 pm she will arrive at her destination. y equals one third times x plus 10 y = 3x + 10 y equals one third times x minus 10 y = 3x − 10
Answer:
a. y equals one third times x plus 10
= y = 1/3(x) + 10
Step-by-step explanation:
Let us represent:
Let the original final plan = x
Let the current flight plan = y
The initial time of departure = 4.00pm
Her flight was then delayed for 10 minutes
We are told in the question that:
The current flight plan allows her arrive at her destination three times faster.
This means y= (1/3)x
y = x/3
Hence the equation generated =
y = x/3 +10
y = 1/3(x) + 10
Answer:
y = 1/3x + 10
Step-by-step explanation:
Write three steps that will result in 4 (x+2)?
Answer:
1. 3x + 5 + x + 3
2. 4x + 8
3. 4(x + 2)
Step-by-step explanation:
1. Write out the problem, break it down.
2. Combine like terms.
3. Factor.
Answer: fist you could Write out the problem and then , break it down.
2. Combine it like terms.
3. And then the Factor.
you had $22 to spend on three pretzels. After buying them you had $15.70.How much did each pretzel cost?
Answer: $2.10
Step-by-step explanation: 22-15.70= 6.3
This means you spent $6.30 on pretzels. Divide 6.30 by 3 to find out how much each pretzel costs. You would get 2.1 (which is written as $2.10 in money).
The rectangle below has been enlarged by a scale of 3.5.
original rectangle: length: 8 units width: 6 units
What is the area of the enlarged rectangle?
A. 48 square units
B. 168 square units
C. 336 square units
D. 588 square units
answer:
The answer is d
Step-by-step explanation:
Answer:
your answer is 588 square units
Step-by-step explanation:
i got it right on the test
What is the area of triangle ABC?
Answer: C
Step-by-step explanation:
If a pair of shoes cost 150 how much will you pay if you get a 15 percent discount ?
Answer: 22.50
Step-by-step explanation:
Answer:$127.50
Step-by-step explanation:
15 percent of 150 is $22.50 so subtract that $22.50 from $150
4) Find the value of x in the given diagram. (3 points)
88°
142°
136°
105°
136°
xº
Answer:
113
Step-by-step explanation:
The given shape has 6 angles so it's a hexagon and the sum of interior angles in a hexagon is = 720
To find the the value of x we need to add all given values up and subtract it from 720:
88 + 142 + 105 + 136 + 136 + x = 720
607 + x = 720 subtract 607 from both sides
x = 113
will give brainliest
Answer:
1. A, 2. A , good luck!!!
Step-by-step explanation:
Which expression is a trinomial of degree 1?
6 + x – y
3x – y
Answer:
=> 6 + x – y
Step-by-step explanation:
=> The trinomial of degree 1 = 6 + x – y
Please help its urgent
Answer:
above is the solution to the question hope it helps. dimensions are in cm, area is in cm^2
15. What is the value of x?
x°
(x + 10)°
(3x - 5)°
X =
Answer:
35
Step-by-step explanation:
x + 10 + 3x - 5 + x = 180
5x + 5 = 180
5x = 175
x = 35
What is the length of the radius?
Answer:
h is 9 inches
Step-by-step explanation:
the volume of the cone is 2π[tex]r^{2}[/tex](h)(1/3）just substitution, easy
75π=2π[tex]r^{2}[/tex](h)(1/3）
Solution:
Given:
[tex]\bullet \ \ \text{Volume of party hat} = 75\pi \text{ inches}^{3}[/tex]
[tex]\bullet \ \ \text{Radius of party hat:}\ 5 \ \text{inches}[/tex]
Recall that the formula to find the volume of a cone is πr²h/3. Now, let's use the formula to find the height.
[tex]\bullet \rightarrow \text{Volume of cone:} \ \dfrac{ \pi r^{2} h}{3}[/tex]
[tex]\bullet \rightarrow \text{Volume of party hat} =\dfrac{ \pi r^{2} h}{3} = 75\pi \text{ inches}^{3}[/tex]
[tex]\bullet \rightarrow \dfrac{ (\pi )( 5^{2})( h)}{3} = 75\pi \text{ inches}^{3}[/tex]
[tex]\bullet \rightarrow (\pi )( 5^{2})( h)} = 75\pi \times 3[/tex]
[tex]\bullet \rightarrow { (\pi )( 25)( h)}= 225\pi[/tex]
[tex]\bullet \rightarrow \dfrac{{ (\pi )( 25)( h)}}{25} = \dfrac{225\pi}{25}[/tex]
[tex]\bullet \rightarrow { (\pi )( h)}= 9\pi[/tex]
[tex]\bullet \rightarrow \dfrac{{ (\pi )( h)}}{\pi } =\dfrac{ 9\pi}{\pi }[/tex]
[tex]\bullet \rightarrow \boxed{\bold{h= 9 \ \text{inches}}}[/tex]
Thus, the height of the party hat is 9 inches.
You are standing on a dock that is 8 feet above the surface of a lake. You jump in the lake and touch the bottom, which is 10 feet below the surface of the water. What is the total distance that you have traveled?
Can anybody help me please with question 1 please and thank you .I would really appreciate it so much.
Answer:
Given
Step-by-step explanation:
At the beginning it says "Given: AB = CB" so they just gave you that information.
Water flows through a pipe at a rate of 5 pints per minute. Express this rate of flow in liters per hour. Round your answer to the nearest whole number. please help!!!
Answer:
142 l/hr
Step-by-step explanation:
Answer:142
Step-by-step explanation:
A group of friends was eating in a restaurant the bill is $415.28 and they paid 18% tip, what was the total?
Answer:
$490.03
Step-by-step explanation:
($415.28)(0.18) = $74.75
$415.28 + $74.75 = $490.03
Pleaseee Help me ? THANK YOU!!!
Answer:
11
Step-by-step explanation:
3³ - (6 - 2)²
3³ - 4²
27 - 16
11
Answer:
Please mark as brainliest;)
What is the last digit when you multiply by 10?
5
1
0
Answer:
0 is the last digit. Hope this helps
Solve this please and send
Answer:
Where is the question mate ????
Answer:
question please .........
please help will give brainliest to the correct answer
Answer:
Step-by-step explanation:
One way to answer this problem is to notice as x goes up 1, y will go up 2. The relationship is linear. No exponential function is going to do that. The jump will not be so easily described.
So what's the answer?
The exact description is D. It is just what I wrote in more general terms.
A jacket's original price is $65.00. It is on sale for 40% off. You have to pay 5% sales tax. What is the final price for the jacket?
Explain good pls
Answer:
$40.95
Step-by-step explanation:
Original price = $65.00
If the jacket is on sale for 40% off, then it is now 60% of the original price.
60% = 60/100 = 0.6
⇒ 60% of $65.00 = 0.6 × 65
= $39
If we have to pay 5% sales tax, then this means that the final price will be 105% of the sale price.
105% = 105/100 = 1.05
⇒ 105% of $39 = 1.05 × 39
= $40.95
Discount:-
[tex]\\ \rm\rightarrowtail 0.40(65)=26\$[/tex]
Now
Price after discount=65-26=39$So
Sales tax is 5%
Total price=39+0.05(39)=40.95$
Assessment timer and count
Assessment items
Item 3
A lamp is on sale, and its price is reduced from $80 to $50.
What is the percent of decrease?
Answer:
37.5 percent
Step-by-step explanation:
Finding percent is simple. You want to find percent of the price drop so you subtract 50 from 80 and get 30. Once you get 30 you divide by 80 (your original price). Once you do this you will get 0.375. Multiply this by 100 to get your percent.
Can you answer the question on the picture
Answer:
[tex]\huge\boxed{\sf 6x^2-x+16}[/tex]
Step-by-step explanation:
[tex]= (2x-3)(3x+4)\\\\Expand\\\\= 2x(3x+4)-3(3x+4)\\\\Distribute\\\\= 6x^2+8x-9x+16\\\\= 6x^2-x+16\\\\\rule[225]{225}{2}[/tex]
Answer:
6x²-x-12
Step-by-step explanation:
(2x-3)(3x+4)
2x(3x+4) -3(3x+4)
6x²+8x-9x-12
6x²-x-12
What is the slope of a line that is perpendicular to the line
y=−4/5x + 7
Answer:Thats Just Notes To Right Down.
Step-by-step explanation:
The slope-intercept form is y=mx+b y = m x + b , where m m is the slope and b b is the y-intercept. Using the slope-intercept form, the slope is 45 4 5 . The equation of a perpendicular line to y=4x5+7 y = 4 x 5 + 7 must have a slope that is the negative reciprocal of the original slope.
Write an equation of the line passing through the points (4, 15) and (-2, -21).
Step-by-step explanation:
(y2-y1)/(x2-x1)=(y-y1)/(x-x1)
(-21-15)/(-2-4)=( y-15)/(x-4)
6(x-4)=y-15
6x-y-9=0