Add the numbers using the number line.-7 + (8) 
A. 15
B. -15
C. 1
D. -1
Answer: C
Mathematics
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Provide an appropriate response.The half-life of a radioactive substance is 65 years. If you start with some amount of this substance, what fraction will remain in 139 years?
A. 4.40 B. 0.01 C. 0.23 D. 0.05
Mathematics
Write the decimal as a fraction or mixed number in lowest terms.20.035
A. 20
B. 
C. 
D. 4
Mathematics
Solve the equation.
+ 
= -1
A. 5
B. 0
C. No solution
D. - 
Mathematics
Solve the problem.The cost to make a product is M(x,y) = 12x2 + 4y2 - 12xy + 50, where x is material cost, y is labor cost. The company spends $13 on materials and $7 on labor. Use the differential to estimate the change in cost if the company spends $17 on materials and $5 on labor.
A. -$400 B. -$1824 C. $1824 D. $1112
Mathematics