Martha’s text message plan costs $15.00 for the first 1000 text messages sent plus $0.25 per text over 1000 sent. Let C(t) represent the cost of sending t text messages over 1000. Sketch a graph of this relationship, and find and interpret the C(t)-intercept.

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step-by-step explanati∵∵∴∴on:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

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