You have 4 different trophies to arrange on the top shelf of a bookcase. how many ways are there to arrange the trophies?

24 ways.

Step-by-step explanation:

If i have n different trophies to arrange on top shelf of a book case then the number of ways in which we can arrange the trophies will be

     = n!

When n = 4

Then number of ways in which we can arrange the books

= 4!

= 4 × 3 × 2 × 1

= 24

Therefore, answer is 24 ways.

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.

circumference divided by 3.141592654 then timesthe radius twice

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice