Question-

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Three times the sum of a number and ten is forty

Answers to select:

A. 3(n+10)+40 B. 3n+10=40

C. 3n-10=40 D. 3(n+10)=40

The expression is 3(n + 10) = 40

Step-by-step explanation:

⇒ 3(n + 10) = 40

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is