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Algebra
Pregunta

A basic cellular phone plan costs \( \$ 8 \) per m...

A basic cellular phone plan costs \( \$ 8 \) per month for \( 80 \) calling minutes. Additional time costs \( \$ 0.40 \) per minute. The formula \( C = 8 + 0.40 ( x - 80 ) \) gives the monthly cost for this plan, C, for \( x \) calling minutes, where \( x > 80 \) . How many calling minutes are possible for a monthly cost of at least \( \$ 28 \) and at most \( \$ 32 ?\) For a monthly cost of at least \( \$ 28 \) and at most\( \$ 32 , \square \leq x \leq \square \) calling minutes are possible. 

Answer

130≤x≤140

Solución
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