Question

It is math( help please

Answer 1

After 12 months, Quynh will have saved $800

Simply follow the pattern shown on the graph.

Month 1: 250

Month 2: 300

Month 3: 350

Month 4: 400

Month 5: 450

Month 6: 500

Month 7: 550

Month 8: 600

Month 9: 650

Month 10: 700

Month 11: 750

Month 12: 800

Answer 2

Look at the picture.

It's a linear function.

A slope-point formula:

$y-y_1=m(x-x_1)\\\\m=\dfrac{y_2-y_1}{x_2-x_1}$

We have the points (1, 250) and (2, 300).

Substitute:

$m=\dfrac{300-250}{2-1}=\dfrac{50}{1}=50\\\\y-250=50(x-1)\\\\y-250=50x-50\qquad|+250\\\\y=50x+200$

Calculate the value of function for x = 12:

$y=50(12)+200=600+200=800$

Answer: 800