Add or subtract as indicated. Simplify the result whenever possible. Write any answer that contains an improper fraction as a mixed number.
- 
- 
A. 1
B. 1
C. 
D. 
Answer: D
Mathematics
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. 42 ? 45
A. 262,144 B. 16,777,216 C. 16,384 D. 1,048,576
Mathematics
Use a commutative property to complete the statement. Do not simplify.7 + 4 = 
A. 4 - 7 B. 4 + 7 C. 7 ? 4 D. 7 - 4
Mathematics
A satellite has an initial radioisotope power supply of 80 watts (W). The power output in watts is given by the formula below, where t is the time in days. Solve for t to find the time when the power supply is 25W.
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Please round your answer to the nearest whole.
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t = __________ days
Fill in the blank(s) with the appropriate word(s).
Mathematics
Simplify.18 - (9 ÷ 3) + 5 ? 23
A. 55 B. 64 C. 43 D. 160
Mathematics