Omar is packing his bags for his vacation. He has 9 unique shirts, but only 5 fit in his bag.
How many different groups of 5 shirts can he take?

126

Step-by-step explanation:

This is a problem of combination in which we have to select 5 things(shirts) out of 9 things(shirts).

This can be done by which is calculated by

=>

=>9*8*7*6/4*3*2*1= 126

Therefore omar can take 126 different groups of 5 shirts with him.

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.