3(4x6)=(3x4)6 is what property

associative property

Step-by-step explanation:

all that is done is the parenthesis were moved

even though they were moved it doesn't change the answer

250

step-by-step explanation:

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.