Solve the problem.An electrical circuit contains two resistors connected in parallel. If the resistance of each is R1 and R2 ohms, respectively, then their combined resistance R is given the formula R = 
If their combined resistance R is 2 ohms and R2 is 9 ohms, find R1.
A. 
ohm
B. 7 ohms
C. 
ohms
D. 
ohms
Answer: D
Mathematics
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Choose the graph of the function 
, domain 
from the following:
?
A. ?
B. ?
C. ?
D. ?
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Multiply.
? 
A. x + 4
B. 
C. 
D. 
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Solve the problem.Elsie took her father out to dinner for his birthday. The food bill was $52.17. The bill for drinks was $11.21. How much was Elsie's 15% tip, rounded to the nearest dollar?
A. $2 B. $88 C. $8 D. $10
Mathematics