••For item 13 to 17,given the verbal phrase, choose the letter of the corresponding mathematical phrase.

13. Ten added to a twice number x.
a. 10 + x
b. 10 + 2x
c. 10x + 2
d. 10x + 2x

14. The product of x and the square of y.
a. xy²
b. x²y
c. x²y²
d. (xy)²

15. Twice the product of 3 and x.
a. 2(3x)
b. 2(3+x)
c. 3(2x)
d. 3(2+x)

16. Four times the sum of a number x and ½?
a. 4(x+ ½)
b. 4x+ ½
c. 4(x- ½)
d. 4x- ½

17. The difference of x and y divided by 2.
a. (x+y)/2
b. x+y/2
c. (x-y)/2
d. x-y/2


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