Two cars start at the same point and travel in the same direction at the average speeds of 70 miles per hour, and 40 miles per hour . determine after how much time ( in hours) the two cars will be 105 miles apart

You can check it by solving it in your head.  They are separating at the rate of 55-40 or 15 miles per hour.  So in 1 hour or 60 minutes they'll be 15 miles apart, so in 20 minutes they'll be 5 miles apart, so in 40 minutes they'll be 10 miles apart.  So it has to be 40 minutes.

Step-by-step explanation:

55t-40t=10

15t=10

15t/15=10/15

2/3

40 Minutes

the correct answer is

c. 4

step-by-step explanation:

the given polynomial is

the degree of the polynomial is the highest exponent which is 4.

the -4 is called the leading coefficient.

this polynomial has only one term so it is a monomial.

the correct answer is option c.