Is the relation a function? Yes or No? (4,5),(4,-7), (4,2), (4,0), (4,9)

No it's not a function

Step-by-step explanation:

When the domain repeats either once or more, it's never a function

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.