Combine, if possible.9
+ 4
A. 65
B. 13
C. 36
D. 13
Answer: D
Mathematics
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Solve the problem. Round your answer, if appropriate.A force acts on a certain object in such a way that when the object has moved a distance of r (in m), the force f (in newtons) is given by 
Find the work (in joules) done through the first four meters by evaluating 
A. 64 joules B. 71 joules C. 40 joules D. 120 joules
Mathematics
Phosphorus 32 has a half-life of 14.2 days. If 600 g of this substance are present initially, find the amount present after t days. What amount will be left after 3.55 days? How fast is the phosphorus 32 decaying when t = 3.55? ?
A. 
B. 
C. ?
D. ?
Mathematics
Rationalize the denominator.
A. 
(
+ 1)
B. 
(
- 1)
C. 
(
+ 1)
D. 
(
+ 1)
Mathematics
Add. Simplify, if possible.17
+ 
A. 14
B. 14
C. 15
D. 15
Mathematics