Hector ' s age is 4 less than a number x. hector is 12 years old. find the number.

The wheels of a bicycle have a diameter of 70cm. how many meters will the bicycle travel if each wheel makes 50 revolutions

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0

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!