For the following problem, solve the inequality. $15 \leq 10 t - 5 t - 20$
A) $( 7 , \infty )$
B) $[ 8 , \infty )$
C) $[ 7 , \infty )$
D) $[ - 7 , \infty )$
E) none of these

Question

Quizplus · Accepted Answer

First, simplify the inequality: 
$15 \leq 5t - 20$
Add 20 to both sides: 
$35 \leq 5t$
Divide both sides by 5: 
$7 \leq t$
So the solution is $[7,\infty)$. Therefore, the answer is choice C.

For the Following Problem, Solve the Inequality 15≤10t−5t−2015 \leq 10 t - 5 t - 2015≤10t−5t−20

For the Following Problem, Solve the Inequality $15 \leq 10 t - 5 t - 20$