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3 years ago

a teacher had 21 red pens. if the ratio of red pens to blue pens owned was 3:1 how many pens did she have in total

1 answer:

6 0

If the ratio of red to blue pens is 3:1, we can find the amount of blue pens by multiplying by 1/3, to get 21*1/3=7. There are 21 red pens and 7 blue pens, so there are 21+7=28 pens total.

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Alexandra [31]

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3 years ago

A spinner is half red and half blue. If you spin the spinner twice, what is the probability that you will get red both times?

Usimov [2.4K]

Answer: Probability of getting red both times is $\frac{1}{4}$

Step-by-step explanation:

Since we have given that

A spinner is half red and half blue.

Probability of getting red is given by

$\frac{1}{2}$

Probability of getting blue is given by

$\frac{1}{2}$

Since he spins the spinner twice.

Probability that you will get red both times is given by

$\frac{1}{2}\times \frac{1}{2}\\\\=\frac{1}{4}$

Hence, Probability of getting red both times is $\frac{1}{4}$

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3 years ago

A square room has a floor area of 81 square meters. The height of the room is 5 meters. What is the area of one wall

VMariaS [17]

Area of a square is side length ^2

To find the length of the side of a square from the area, that’s the square root of the area:

Length of side = sqrt(81) = 9 meters

Area of wall = length of side x height:

Area of wall = 9 x 5 = 45 square meters

Answer: 45 square meters

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2 years ago

HELP! After finding area explain the reasoning you used to find the area and I’ll give brainliest!

UkoKoshka [18]

Answer:

The answer is 180 yds squared.

Step-by-step explanation:

Segment the areas. One area has the measurements 5 and 6. Then the other one has measurements 15 and 10. This means you get 150 + 30. The answer is 180 yds squared.

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2 years ago

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lianna [129]

Answer:

I proved

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Step-by-step explanation:

Its my choice

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3 years ago