The cost of car service is partly constant and partly varies with the time it takes to do the work it cost $3500 for a 5.5 hour service and 2900 dollars for a 4 hour service. a) find the formula connecting $3 with time T hours.
b) find the cost of a 7.5 hour service.

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step-by-step explanation:

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

exactly you go it

step-by-step explanation:

i think the answer is b