The average of 3, 15, and my number is 40. What is my number?

the average of 3 and 15 is 9

Step-by-step explanation:

102

Step-by-step explanation:

Let your number be n

The average of 3 ,15 and your number is found by adding the three numbers and dividing by 3

(3+15+n)/3

That is equal to 40

(3+15+n)/3=40

Multiply each side by 3 to get rid of the fraction

(3+15+n)/3 *3 = 40*3

(3+15+n) = 120

Combine like terms

18+n = 120

Subtract 18 from each side

18-18 +n = 120-18

n =102

Your number is 102

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step-by-step explanation:

the system of inequity is

step-by-step explanation:

from the given graph it is noticed that we have two related lines. one is solid and another is dashed.

if a line passing through two points, then the equation of line is

the solid line passing through the points (0,4) and (4,0).

the related equation of solid line is .

similarly, find the related equation of dashed line. the dashed liune passing through the points (0,0) and (3,1).

the related equation of dashed line is

from the given graph it is noticed that the point (0,1) lies on the shaded region, therefore the point (0,1) must be satisfied by the related equations.

check the related equations by the point (0,1).

this statement is true if the sign of inequality is < instead of equality. since it is an solid line therefore the sign of inequality will be . the required inequality is

similarly, check the second related equation.

it is a dashed line, so this statement is true if the sign of inequality is > . the required inequality is