After 10 weeks, the boys will have same amount in savings.
Step-by-step explanation:
Given,
Roberto already have $30.
Amount saved each week = $5
Let,
x be the number of weeks.
R(x) = 30+5x
Amount saved by Jack each week = $8
J(x) = 8x
For same amount, the functions will be equal.
R(x) = J(x)

Dividing both sides by 3

After 10 weeks, the boys will have same amount in savings.
Keywords: functions, division
Learn more about functions at:
#LearnwithBrainly
Answer:
2 equivalent expressions w/ negative signs in different places.
a)
=-1/5 x and x/-5
b)
=14/-y and -14/1/y
c)
=a/1/b and 1/b/1/a
d)
=-c/y and -c/1/y
Answer:
(x-4) (x-4)
Step-by-step explanation:
foil [first, outside, inside, last]
x^2 -8x = 16
(x-4) (x-4) = x^2 -4x -4x +16 = x^2 -8x +16