What is 4 1/2 x 2 1/2 x 1/2

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!

Arectangular yard has area 96 square feet. if the width of the yard is 4 feet less than the length