Simplify.
- 
A. 
B. 
C. 
D. 
Answer: C
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Multiply. Change any mixed number to an improper fraction before multiplying.-4
? -5
A. 20 B. 25 C. 18 D. 24
Simplify the expression by combining like terms if possible.
x2y + 
x2y
A. 
x2y
B. 
x2y
C. 
x2y
D. 
x2y
Use the method of natural frequencies to find the indicated probability.A company manufacturing electronic components for home entertainment systems buys electrical connectors from three suppliers. It buys 21% of the connectors from supplier A, 38% from supplier B, and 41% from supplier C.It finds that 1% of the connectors from supplier A are defective, 2% of the connectors from supplier B are defective, and 3% of the connectors from supplier C are defective. If a customer buys one of these components and finds that the connector is defective, what is the probability that it came from supplier B?
A. 0.345 B. 0.02 C. 0.095 D. 0.528
Solve the problem.The rate of growth of a microbe population is given by 
where x is time in days. What is the growth after 1 day?
A. 62.52 B. 62.92 C. 55.42 D. 110.84