Joe’s cell phone costs him $21 per month plus $3 for every 1gb of data downloaded. what is the limit to the number of gbs he can download to stay within his monthly budget of $30.

He must use  3 GB or less

Step-by-step explanation:

Total cost = flat fee + number of GB * charge per GB

We  know he must stay under 30 dollars so change the equals to less than or equal to (the opening facing the 30) and replace the total cost with 30

30≥ flat fee + number of GB * charge per GB

We know the flat fee is 21 and the charge per GB is 3

30≥ 21 + number of GB * 3

Subtract 21 from each side

30-21 ≥ 21-21 + number of GB * 3

9≥number of GB * 3

Divide by 3

9/3 ≥ number of GB * 3/3

3≥  number of GB

He must use  3 GB or less

gregory's graph is incorrect because it shows 2 inches of growth for each week when it should show 0.75 inches of growth each week.

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