A car travels for 4(t+3) hours at a constant speed of 10(t+3)km/h if the total distance traveled by the car is 810km find the speed of the car?

Step-by-step explanation:

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45 km/h

Step-by-step explanation:

4(t+3) = 4t + 12

10(t+3) = 10t + 30

(4t + 12) (10t + 30) = 40t² + 240t + 360 = 810

4t² + 24t - 45 = 0

(2t - 3) (2t +15) = 0

t = 3/2 or t = - 15/2

Speed: 10(t+3) = 45 or -75

speed is positive: speed = 45 km/h

the final amount you will pay is $68.04.

the tip is determined by the pre-tax amount, so we calculate the tip based on the original bill, not after we've added sales tax.

to find the tip:

we can divide 54.00 by 100 to get 1% of 54. then we multiply that by 18.

54 / 100 = .54

.54 x 18 = 9.72

tip = 9.72$

to find the tax:

we can divide 54.00 by 100 to get 1% of 54. then we can multiply that by 8 to get 8%.

54 / 100 = .54

.54 x 8 = 4.32

tax= 4.32

now we can add the tip and tax to the bill to get our total.

54 + 9.72 + 4.32 = 68.04

total: $68.04

step-by-step explanation:

answer: c. is your answer

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