The ratio of pencils to pens is 3 to 5. There are 21 pencils in the classroom. How
many total pens and pencils are in the classroom?

Answers

Answer 1

Answer:

56 pencils and pens

Step-by-step explanation:

3:5 is the ratio, and then put that into a fraction and then make a proportion

3/5=21/x

eCross multiply and divide so do 21*5 divided by 3. This gives us an answer of 35. Now we know we have 35 pens. 35+21, adding the pen and pencil, is 56. You can always also look for relationships, so if you could see that multiplying 7 gives you the answer, than do that to the 5, and then add it together.


Related Questions

An equation for a line that is perpendicular to the line given by y=-2 and passes through the point (5,6)

Answers

Answer:

y - 6 = 1/2 (x - 5)

Step-by-step explanation:

Point slope equation:  y-y₁ = m(x-x₁)

replace

x₁ = 5,

y₁ = 6,

m = 1/2 (perpendicular means opposite reciprocal)

try to help at least

Answers

When it says positive slope the line is going up.When it says negative slope the line goes down.For the y intercept it means like where on the Y-line it is if it’s on the top half of the X line then it’s positive, and below is negative

Answer:

Graph 1: Lang

Graph 2: Sharayah

Graph 3: Caleb

Graph 4: Tierra

Step-by-step explanation:

Graph 1 y-intercept: 2

Graph 2 y-intercept: -2

Graph 3 y-intercept: -3

Graph 4 y-intercept: 3

Graph 1: Positive

Graph 2: Negative

Graph 3: Positive

Graph 4: Negative

Sarah is training for a bike race. She rides her bike 5 3/4miles in 1/3hour. What is Sarah’s rate in miles per hour? Express your answer as a mixed number.

Answers

Answer:

3 31/76

Step-by-step explanation:

5 3/4 multiplied by 3 = 3 31/76

hope this helps

help pls i’m just guessing i don’t understand

Answers

Answer:

70

Step-by-step explanation:

Since the angle 2 is alternate angle to angle 6,they are both equal. So, the angle 6 is 70.

Find the distance between the two points (-1,0) (-8.4)

Answers

Answer:

d = 8.062258

Step-by-step explanation:

=(−8−(−1))2+(4−0)2‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾√

=(−7)2+(4)2‾‾‾‾‾‾‾‾‾‾‾‾√

=49+16‾‾‾‾‾‾‾√

=6‾√5

=8.062258

Find the slope and the y intercept for the equation below 2x+y=7

Answers

Answer:

Slope: -2

Y intercept: (0,7)

Step-by-step explanation:

The given line segment has a midpoint at (3,1). What is the equation in the slope intercept form of the perpendicular bisected of the given line segment

Answers

Answer:

The ANswer Is A

Step-by-step explanation:

I took The quiz

Edison
Edison's first light bulb stayed
lit for 40 hours. Today a
typical light bulb can stay lit
for 1,000 hours. How many of
Edison's light bulbs would burn
out before one of today's light
bulbs burns out?

Answers

Answer:

25 light bulbs

Step-by-step explanation:

You just divide 1000 by 40

How do I solve this?? Please help! Find the measure of the indicated angle.

Answers

Answer:

This is a tough one, I see why you are confused. The answer would be 50

Step-by-step explanation:

I used process of elimination and working backwards

First I took the first option (50) and added 10. Then divided it by 5 to isolate the X value. I plugged the X value into the (11x+3) and got 135. The missing angle is 45. 50+45+85=180

Hope this helped!

Which one doesn't belong, and why?
1/2,5/3,2/10,2/5

Answers

Answer:

5/3

Step-by-step explanation:

5/3 doesn't belong because each denominator for the other numbers are all factors of 10 (I think thats how you say it)

Hope this helps

What is the next number in the sequence: -2, 4, -8, 16, -32, , ...

Answers

Answer:

64

Step-by-step explanation:

This is an Geometric sequence

Common ratio = 2nd term ÷ 1st term = 4 ÷ (-2) = -2

To get the next term multiply the previous term by (-2)

The next term (6th term) = -32 * (-2) =  64

A rectangle has a height of 3c^43c
4
3, c, start superscript, 4, end superscript and a width of c^2-4c+3c
2
−4c+3c, squared, minus, 4, c, plus, 3.

Answers

Answer:

Step-by-step explanation:

The area of rectangle is 3[tex]c^{6}[/tex]-12[tex]c^{5}[/tex] + 9[tex]c^{4}[/tex].

What is area of rectangle?

The area of any rectangle is calculated, once its length and width are known. By multiplying length and breadth, the rectangle's area will obtain in a square-unit dimension.

Area of a Rectangle. A = l × b.

Given:

height = 3[tex]c^{4}[/tex]

width = c² - 4c +3

So, Area of rectangle

=length *  width

= 3[tex]c^{4}[/tex] * (c² - 4c +3)

=3[tex]c^{6}[/tex]-12[tex]c^{5}[/tex] + 9[tex]c^{4}[/tex]

Hence, the area of rectangle is 3[tex]c^{6}[/tex]-12[tex]c^{5}[/tex] + 9[tex]c^{4}[/tex].

Learn more about area of rectangle here:

https://brainly.com/question/20693059

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Your question is incomplete, probably the complete question/missing part is:

A rectangle has a height of 3[tex]c^{4}[/tex] and a width of c² - 4c +3. Express the area of the entire rectangle.

for every 2 cara you wash your friend washes 5 cars if you wash 6 cars how many cars does your friend wash

Answers

Answer:

15 cars

Step-by-step explanation:

2 = 5 so 4 = 10 and 6 = 15

kejejejeididjdeneneneneneneneneneje

Stacey jogs every third day and swims every fourth day. If she jogs and swims on Monday, what is the next day of the week she will end up jogging and swimming.

Answers

Answer:

Saturday

Step-by-step explanation:

First we have to find the LCM of 3 and 4

It is 12, so we know that she will jog and swim every 12 days

This time was Monday, so 12 days after Monday will be the day she both jog and swims.

12 days after Monday is Saturday, so the next time she jogs and swims is Saturday.

Hope this helped

Sorry if it's wrong

:)

WHOEVER ANSWERS FIRST WILL GET BRAINLIEST!

IF YOU DON'T ANSWER FIRST YOU DON'T GET BRAINLIEST

Answers

Answer:

38 cm

Step-by-step explanation:

it makes the most sense

Answer: Id have to say 40mm

A team of runners is needed to run a 1/3-mile relay race. If each runner must run 1/9 mile, how many runners will be needed?

Answers

Answer:

3 Runners

Step-by-step explanation:

Khalid purchased 4 items at the dollar store. He was surprised that the total did not equal $4.00. Brian did not realize that the store required 5 1/2% sales tax. How much was Brian’s total bill including sales tax?

Answers

Answer:

B. $4.22

Step-by-step explanation:

51/2 % can be put into decimal form as 0.055

To find what 5 1/2% of $4 is you simply need to multiply 4 by 0.055

which makes $0.22

add that to $4 and you have your answer

ILL MARK U BRILLIANT PEASE I NEED HELP! the independent variable of a relationship represents the hours someone is driving and the dependent variable represents the number of miles, what does the ordered pair (2,100) represent?

Answers

Answer:

x or 2= amount of hours someone is driving and y or 100= the number of miles

Step-by-step explanation:

during a big storm, 29 inches of snow fell in 8 hours. find the rate

Answers

Answer:

36.25

Step-by-step explanation:

If you want to find the rate to anything, divide the measurements by the time.

29/8= 36.25

Classify angle H in the figure as right, straight, acute, or obtuse. For right angles and straight angles, indicate the
number of degrees in each angle,
Choose the correct classification for angle H
A. Acute
B.Obtuse
C.Straight
D. Right

Answers

It C sry for the mistake

Angle H is a right angle
A right angle means you can draw a square
Square= right angle= 90 degrees

Describe any patterns/relationships that you notice between the Powers of 10, the expressions, what they equal (standard form), or amount of zeros in the product. Try to use math vocabulary in your explanation below. You may use examples to support your response.

Answers

Answer:

The powers of 10 are things of the form:

10^n.

Where we assume that n is an integer number.

if is equal or larger than 0, then:

We add n zeros at the right of the 1.

so let's write some examples.

10^0 = 1  (we do not add any zero)

10^1 = 10 (we add one zero)

10^2 = 100  (we add two zeros)

...

Now, remember that x^-y = 1/x^y, then:

If n is smaller than zero, then we add n zeros at the left of the 1.

10^-1 = 1/10 = 0.1   (one zero at the left)

10^-2 = 1/100 = 0.01    (two zeros at the left).

Those relations will be useful to always know the exact dimensions of the powers of zero.

Now, we can give a more complete description knowing that:

x^a*x^b = x^(a + b)

Then if we have:

10^3*10^4 = 100*1,000 (and this may be hard to do)

But we can use the above relation:

10^3*10^4 = 10^(3 + 4) = 10^7

Then we know that we must add 7 zeros at the right of the 1.

And this will work for any integer powers of 10.

b)
1 + sin^4A ÷cos^4A = 1 + 2tan^2A.sec^2A

Answers

Answer:

see explanation

Step-by-step explanation:

Using the trigonometric identity

tan²x + 1 = sec²x

Consider the left side

[tex]\frac{1+sin^4A}{cos^4A}[/tex]

= [tex]\frac{1}{cos^4A}[/tex] + [tex]\frac{sin^4A}{cos^4A}[/tex]

= [tex]sec^{4}[/tex] A + [tex]tan^{4}[/tex] A

= (tan²A + 1)² + [tex]tan^{4}[/tex] A

= [tex]tan^{4}[/tex] A + 2tan²A + 1 + [tex]tan^{4}[/tex] A

= 1 + 2tan²A + 2[tex]tan^{4}[/tex] A ← factor out 2tan²A

= 1 + 2tan²A(1 + tan²A)

= 1 + 2tan²A sec²A

= right side , thus verified

Match the graph with the correct equation

A: Y= X - 3
B: Y= X + 3




From: SLOPE-INTERCEPT FORM: PART 1

Answers

The answer is B : Y= X+3

Line J M is the perpendicular bisector of LK.

Line J M intersects line L K at point N and forms a right angle.
Which segments are congruent?

JN and LN
JN and NM
LN and NK
NK and NM

Answers

Answer:

The congruent segments are LN and NK ⇒ C

Step-by-step explanation:

If a line is a perpendicular bisector of another line, that means this line intersects the other line in its midpoint and form right angles around this point

∵ Line JM is the perpendicular bisector of line LK

→ That means JM intersect LK at the midpoint of LK

∵ Line JM intersects line LK at point N

∴ Point N is the midpoint of LK

N divides LK into two segments LN and NK

N is the midpoint of LK

→ That means LN equals NK

LN = NK

The congruent segments are LN and NK

Answer:

it C on edge

Step-by-step explanation:

HELP BRAINLEST IF ANSWER PLZ Click LINK TO SEE QUESTION!!!!
https://brainly.com/question/18621006

Answers

Answer:

1. theres no link attached

2. lol just write it here wyd

3. uhm ur not tricking me-

Step-by-step explanation:

Mr. Drew grows green pepper plants in planters.

The graph shows the relationship between the number of planters and the number of pepper plants. How many pepper plants are in 3 planters?

A graph shows green pepper plants by planters. A line starts at (0, 0) and passes through (4, 12).

18

12

9

3

Answers

Answer:

Option (3)

Step-by-step explanation:

From the graph attached,

For a point (x, y),

x-coordinate shows the planters and y-coordinate show the number of green pepper plants in the planters.

If input value (x-value) for the line is 3,

Output value (y-value) from the graph will be, y = 9.

Therefore, there are 9 green pepper plants in 3 planters.

Therefore, Option (3) is the correct option.

7,5 move 4 units left and 1 unit down

Answers

Answer:

(3,4)

Step-by-step explanation:

Answer:

4,3

Step-by-step explanation:

Probability a bag of miniature candy’s contain 15 crunch bars 14 Hershey’s chocolate bars 10 Mr.Goodbars 12 Hershey’s cookies and cream bars. What is the probability of randomly choosing each of them ?

Answers

15:51 for Crunch bars

14:51 for Hershey's

10:51 for Mr. Goodbars

12:51 for Cookies and Cream

There are 51 candies in total. We got that by adding all of the candies together. 15 + 14 + 10 + 12 = 51. The probability can be written as a ratio between the different types of candy and the whole number.

The probability of crunch bars, Hershey’s chocolate bars, Mr.Goodbars, and Hershey’s cookies and cream bars are 15/51, 14/51, 10/51, and 12/51, respectively.

What is Probability?

Probability helps us to know the chances of an event occurring.

[tex]\rm Probability=\dfrac{Desired\ Outcomes}{Total\ Number\ of\ outcomes\ possible}[/tex]

The probability can be written as,

P(Crunch bars) = Number of Crunch bars/ Total number of choclates= 15/51

P(Hershey's Chocolate) = 14/51

P(Mr. Goodbars) = 10/51

P(Hershey’s cookies and cream bars) = 12/51

Hence, the probability of crunch bars, Hershey’s chocolate bars, Mr.Goodbars, and Hershey’s cookies and cream bars are 15/51, 14/51, 10/51, and 12/51, respectively.

Learn more about Probability:

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please help with this question

Answers

Answer:

(1/3)x+ x-20+ x-10+40= 360

Step-by-step explanation:

(1/3)x+ x-20+ x-10+40= 360

x+3x-60+3x-30+120=360*3

7x+30= 1080

7x= 1050

x= 150

The sum of the angles = 360.

Add the 4 angles together so they equal 360:

1/3x + x-20 + x-10 + 40 = 360

Combine like terms:

2 1/3x - 30 + 40 = 360

Continue combining like terms:

2 1/3x +10 = 360

Subtract 10 from both sides:

2 1/3x = 350

Divide both sides by 2 1/3:

x = 150

if syn spends 15 minutes running, he burns 200 calories. how long would it take Syn to burn 150 calories?

Answers

Answer:

11.25min

Step-by-step explanation:

In this problem, we first need to find the rate at which syn burns calories per minute

so in 15mins, he burns 200 calories

    in 1 mins he will burn x

x= 200/15

x=13.33 calories per min this is the rate

So in one minute he will burn 13.33 calories

Now using the idea of rate=quantity/time

the rate=13.33

quantity=15 calories

time=?

time=quantity/rate

time=150/13.33

time=11.25min

   Alternatively

(very fast approach)

         if syn spend 15min to burn 200 cal

then he will spend x min to burn 150 cal

cross multiply

x=(150*15)/200

x=2250/200

x=11.25mins

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