Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.Two numbers total 4, and their difference is 20. Find the two numbers.
A. 12 and - 8
B. 4 and 2
C. 2 and - 18
D. 3 and 1
Answer: A
Mathematics
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Is the first number divisible by the second number? Answer yes or no.234,270; 30
A. Yes B. No
Mathematics
Factor using the formula for the sum or difference of two cubes.8x3 - 1
A. (2x - 1)(4x2 + 1) B. (8x - 1)(x2 + 2x + 1) C. (2x - 1)(4x2 + 2x + 1) D. (2x + 1)(4x2 - 2x + 1)
Mathematics
Solve the problem.The volume of a sphere is increasing at a rate of 3 cm3/sec. Find the rate of change of its surface area when its volume is 
cm3. (Do not round your answer.)
A. 
cm2/sec
B. 
cm2/sec
C. 6? cm2/sec
D. 1 cm2/sec
Mathematics
Differentiate.f(x) = 
at x = 2Enter just a reduced fraction.
Fill in the blank(s) with the appropriate word(s).
Mathematics