Question

7r-9s+2r
evaluate for the following expressions for r=7,s=-2 and t=5

Answer 1

81

Explanation:

Simplify it first:

7r-9s+2r = 7(7)-9(-2)+2(7) = 49-(-18)+14

(Since you have 49-(-18) it automatically becomes addition/a positive.)

So you have 49+18=14 which equals 81.

Hope this helps :)

Answer 2

91

Explanation:

7(7) - 9(-2)+2(7)

=142+49

=91