Acell phone company charges $55 per month for unlimited minutes plus $0.25 per text sent. if the charges to daynes cell phone for last month came to $100, home many texts did he send?

180

Step-by-step explanation:

0.25x180=45

55+45=100

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

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