Two problems I can't get is; 94-4.8 I know the answer is 89.2 but how?

To test an individual's use of a certain mineral, a researcher injects small amount of a radioactive form of that mineral into the person's bloodstream. The mineral remaining is the bloodstream is measured each day for several days.

Linear equations definition for 2nd grade

A sequence is defined by the recursive function in + 1) = An). If $ (3) = 9, what is (1) ?

Perimeter of a square field is 1.6 kilometers. what is the area of the field in square kilometers?

How many times larger is a 10 pound dog than a hamster weighing five eighth pounds

The difference of 17 and 5 tines a number

Fran's store spent 64,000 on expenses last year, Rent for the store was 35% of those expenses. How much did Fran spend on rent?

What is the answer to this (143 (5) + 67) 5=

Least common multiple of 10 and 15

Adam's father spent 1 hour and 50 minutes working on his truck. If it was 7:35 when he stopped working, what time was it when he originally started?