Rachel’s friend yassi has to write 3(b + s) pages for reports. use properties of operations to determine whether this expression is equivalent to the expression for the number of pages rachel has to write.

3b+3s

Step-by-step explanation:

The first part of this question is:

Rachel needs to write 3 book reports with b pages and 3 science reports with s pages during the school year. How do you write an algebraic expression for the total number of pages Rachel will need to write?

This means Rachel has to write 3b+3s pages

Now, if Yassi has to write 3(b + s) pages, we can use the distributive property and the result is:

3(b + s)=3b+3s

Which is the same number of pages Rachel has to write.

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step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: