[2] When the summer is over, Billy goes back to school with the money saved from question 1.b. While at school, Billy takes the same amount of money every week from
his savings. After 10 weeks his sayings were down to $1,640.
a) How much money will remain in Billy's savings after 24 weeks?
b) After how many weeks will all of Billy's savings be gone?

i think the answer is seven, for if i'm being useless °ω°

step-by-step explanation:

step-by-step explanation:

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this