Add or subtract, as indicated. Assume that all variables represent positive real numbers.8
+ 
- 7
A. 15
+ 
B. 
C. 
+ 
D. 
Answer: C
Mathematics
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Determine whether or not one or more pairs of twin primes exist between the pair of numbers given. If so, identify the twin primes.81 and 100
A. 89, 91 B. 83, 85 C. 91, 93 D. No
Mathematics
Evaluate the exponential expression.-120
A. 20 B. -1 C. -20 D. 1
Mathematics
Find the sum of the infinite geometric series, if it exists.2 + 
+ 
+ 
+ . . .
A. 3
B. 
C. 
D. does not exist
Mathematics
Perform the indicated operation. Write the answer in simplest form. If the answer is an improper fraction, write it as a mixed number.
A. 6
B. 14
C. 5
D. 6
Mathematics