You are saving for a skateboard. Your aunt gives you $45 to start and you save $3 each week. The expression 45 + 3w gives the amount of money you save after w weeks. How much will you have saved after 4 weeks?
To find out how much you will have saved after 4 weeks, substitute 4 for w in the expression 45 + 3w.
45 + 3(4) = 45 + 12 = <<45+12=57>>57
After 4 weeks, you will have saved $57. Answer: \boxed{57}.
To find out how much you will have saved after 4 weeks, substitute w with 4 in the expression 45 + 3w:
45 + 3(4) = 45 + 12 = 57
After 4 weeks, you will have saved $57.
To find out how much you will have saved after 4 weeks, we can plug in the value of w as 4 into the expression 45 + 3w.
So, substituting w with 4 in the expression, we get:
45 + 3(4)
To simplify the expression, we first multiply 3 by 4:
45 + 12
And then, we add 45 and 12 together:
57
Therefore, after 4 weeks, you will have saved $57.