Can anyone help me with this answer?

9514 1404 393

  D

Step-by-step explanation:

Do this multiplication the same way you would for integers. The "place value" of a column is the power of x for that column.

The sum of partial products matches answer choice D.

_____

Additional comment

We used a spreadsheet because it provides a nice grid for aligning rows and columns. If you want to have the spreadsheet do the multiplication and sum, you need to leave out the variables. Here, we did the multiplication and sum mentally and used the spreadsheet simply to record the result.

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

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: