A cell phone plan costs $28.80 per month for 500 minutes of talk time. It costs an additional $0.06 per minute for each minute over 500 minutes. To get e-mail access, it costs %30 of the price for 500 minutes of talk time. Your bill, which includes e-mail, is the same each month for 7 months. The total cost for all 7 months is $288.54. Write and solve an equation to find the number of minutes of talk time you use each month. Let m represent the number of minutes over 500 minutes each month. Which equation represents the given situation?

A.288.54=7(0.06m+28.80+0.30(28.80))
B. 288.54=7(m+28.80+0.70(28.80))
C. 288.54=7(0.06m+28.80)

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form

8

step-by-step explanation: