If 18 of the 45 students in the band play woodwind instruments , what percent of the students do not play woodwind instruments ?

Mathematics

1 answer:

choli [55]4 years ago

3 0

40 percent of the class play woodwind instruments

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To solve the equation 8d = 2d . Lin divides each side by 2d, and Elena subtracts 2d from each

Sedbober [7]

No. only elena is correct

explanation: in order to solve the equation you first need to subtract 2d from both sides so it’ll look like this

8d-2d = 2d-2d

then you need to combine like terms (the new terms you added are both negative so it cancels out the right side) and it’ll look like this

6d = 0

finally, to find d, divide both sides by 6 because its being multiplied by d
6d/6 = 0/6

zero divided by anything is zero so you are left with:

d = 0

7 0

3 years ago

can someone help me understand this, please? For some reason my answer is correct but I need to understand how did I found the c

Morgarella [4.7K]

Answer with step-by-step explanation:

The way the question is worded, this actually shouldn't be correct. The correct answer should be $3:4$ .

Because the trapezoids are similar, we can find the ratio of their perimeters by actually just finding the ratio of their sides.

Why?

By definition, the corresponding sides of a polygon are in a constant proportion. The perimeter is simply the sum of all sides of the polygon. Since we're just adding the sides, the proportion will still be maintained.

Therefore, we'll just need to ratio of their corresponding sides. The only two corresponding sides that are marked are $\overline{RS}$ and $\overline{AB}$ .

The ratio of $\overline{RS}:\overline{AB}$ is $18:24\implies \boxed{3:4}$ .

The reason why it ideally should be $3:4$ and not $4:3$ is because the question states $RTSU\sim ABCD$ , which mentions $RSTU$ first, so our answer should follow this respective order. I believe you were marked right anyways because the specific order is not specified, but generally, you want to give your answer respectively by default.