Home > CAAC > Chapter 2 > Lesson 2.1.3 > Problem 2-30
Read the Math Notes box for this lesson. Then evaluate each expression below. Homework Help ✎
For y = 2 + 3x when x = 4, what does y equal?
For a = 4 − 5c when c =
, what does a equal?For n = 3d 2 − 1 when d = −5, what does n equal?
For v = −4(r − 2) when r = −1, what does v equal?
For 3 + k = t when t = 14, what does k equal?
Rewrite the expression, substituting in the known variable.
y = 2 + 3(4)
y = 2 + 12
y = 14
See part (a) for a strategy to evaluate this expression.Remember to pay attention to negative signs.
a = 6.5
Rewrite the expression, substituting in the known variable.
n = 3(−5)² − 1
n = 3(25) − 1
n = 75 − 1
n = 74
Refer to parts (a) and (c).
Rewrite the problem, substituting in the known variable and then rearrange the problem to make it equal to the unknown variable.