Lucy and Barbara began savings money the same week. The table below shows the models for the amount of money Lucy and Barbara had saved after x weeks.

Lucy's savings f (x) = 10x+5

Barbara's savings g (x) = 7.5x+25

after how many weeks will Lucy and Barbara have the same amount of money saved?

a) 1.1 weeks

b) 1.7 weeks

c) 8 weeks

d) 12 weeks

Question

Bruce Burke

Mathematics

19 April, 00:37

Lucy and Barbara began savings money the same week. The table below shows the models for the amount of money Lucy and Barbara had saved after x weeks.

Lucy's savings f (x) = 10x+5

Barbara's savings g (x) = 7.5x+25

after how many weeks will Lucy and Barbara have the same amount of money saved?

a) 1.1 weeks

b) 1.7 weeks

c) 8 weeks

d) 12 weeks

+3

Answers (1)

Know the Answer?

Cheyenne Warner · Answer 1

You just put the answers into the equation so a) 10x1.1 + 5 = 16

7.5x1.1 + 25 = 33.25

b) 10x1.7 + 5 = 22

7.5x1.7 + 25 = 37. 75

c) 10x8 + 5 = 85

7.5x8 + 25 = 85

In c ^ they both have the same amount of money (85) so the answer is c