Find all solutions to 6x^4+13x^3–71x^2+67x=15​

x = 1 or x =  3  / 2  or x = −5 or x =  1  / 3

Refer the attachment for steps

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b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.