Answer:
a. 0.10x < 12 + 0.02x
b. x < 150
Step-by-step explanation:
a. For sending x texts, the cost of Plan A in dollars is ...
0.10x
For sending x texts, the cost of Plan B in dollars is ...
12 + 0.02x . . . . . . where 12 is the monthly charge regardless of texts sent
We want the Plan A charge to be less than the Plan B charge, so the inequality is ...
0.10x < 12 + 0.02x
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b. Subtract 0.02x:
0.08x < 12
Divide by 0.08
x < 12/0.08
x < 150 . . . . . the solution to the inequality
