Ricki has a prepaid cellphone. last week ricki made 4 call and sent 20 text messages which cost him $4. this week he made 10 calls and sent 5 text messages which cost him $5.50. write a system describing the number of calls, c, and the number of text messages, t, that ricki made over the past two weeks

Step-by-step explanation:

Let c be cost of each call and t represent cost of each text message.

We have been given that last week Ricki made 4 call and sent 20 text messages which cost him $4.

Cost of 4 calls would be .

Cost of 20 text messages would be

Total cost id $4.00.

We can represent this information in an equation as:

We are also told that this week he made 10 calls and sent 5 text messages which cost him $5.50.

Cost of 10 calls would be .

Cost of 5 text messages would be

Total cost id $5.50.

We can represent this information in an equation as:

Therefore, our required system would be:

sorry, i can't understand your question. will later if you describe more clearly!

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45

step-by-step explanation:

to find a percentage, add a decimal in front and multiply it by the other number.

.25 times 180= 45