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3 years ago

I don't understand this

Mathematics

1 answer:

MAXImum [283]3 years ago

7 0

Answer:

16 weeks

Step-by-step explanation:

Set up a proportion with the equation.

a = 2w

2 x 8= 16 then 16/1=16

so she was at school for 16 weeks.

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A rectangular box contains 198 cubic inches. If a similar box has the same width but triple the length and triple the height, ho

katovenus [111]

Answer:

the volume of the 2nd box is 1200 cubic inches

Step-by-step explanation:

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4 years ago

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Spencer has a wooden post that is five and three sevenths feet long. He cut two and one half feet off the post. What is the leng

Vaselesa [24]

Answer:

2 13/14 feet

Step-by-step explanation:

The remaining length is the difference between the starting length and the amount cut off:

5 3/7 - 2 1/2 = (5 -2) +(3/7 -1/2) = 3 +((3·2-7·1)/(7·2)) = 3 -1/14

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_____

<em>Additional comment</em>

Addition and subtraction of fractions can be accomplished using a formula that does not rely on finding a least common denominator. In this case, the denominators have no common factors, so their product is, in fact, the least common denominator.

$\dfrac{a}{b}-\dfrac{c}{d}=\dfrac{ad-bc}{bd}$

6 0

3 years ago

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A county has a population density of 257 people per square mile. The county population is 4288. What is the area of this county?

SOVA2 [1]

Answer: 17 miles

Step-by-step explanation:

Hi, to answer this question we have to apply proportions:

A county has a population density of 257 people per square mile.

The proportion is : 257 people / 1 square mile

For 4288 people: 4288 people / x miles

So:

257 people / 1 square mile = 4288 people / x miles

257/1 = 4288 /x

Solving for x

x = 4288/ (257/1)

x = 16.68 = 17 miles (rounded)

3 0

3 years ago

Solve for x<br> 3x(3+5x)=240

AleksandrR [38]

Answer:

x = 10

Step-by-step explanation:

3 $3x(3+5x)=240\\9x+15x^{2} =240\\\\9x+\sqrt{15x^{2} } =240\\9x+15x=240\\24x=240\\x=10$

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3 years ago

What is the following product? Assume b>/= 0

andrew-mc [135]

Answer:

Step-by-step explanation:

we have

$\sqrt{b}*\sqrt{b}$

Rewrite the expression

$\sqrt{b}*\sqrt{b}=(b^{\frac{1}{2}})*(b^{\frac{1}{2}})$

we know that

When multiplying two powers that have the same base, you can add the exponents

$(b^{\frac{1}{2}})*(b^{\frac{1}{2}})=b^{(\frac{1}{2}+\frac{1}{2})}=b^{1}=b$

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4 years ago

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