Help you with what? where’s the problem?
X=9 ; the length is 7 and width is 10
A) Original price : y =10.x
Cheaper brand : y = 7x
The original box is $3 more than the cheap one. Proof:
Suppose 1 box is bought of each (x=1),original will cos10 & the cheaper $7
b) Each time he buys a cheap brand he save $3 ($10-$7), on 5 cheap boxes, he would save $3 x 5 boxes = $15
5(2x+3)
=10x+15 Multiplied the bracket by 5
A. 10x+3 no
B. 10x+15 yes
C. 8x+2x+15 yes
D. 25x no
Answers are B. (10x+15), C.(8x+2x+15)