For problem 5-9, solve the system of equations by substitution.

A.
B.
C.
D.
E. None of these


Answer: D

Mathematics

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Use radical notation to write the expression. Simplify if possible.(-64)4/3

A. 4096 B. not a real number C. 256 D. -256

Mathematics

Solve the problem.The formula D = 7e-0.04h can be used to find the number of milligrams D of a certain drug in a patient's bloodstream h hours after the drug has been given. When the number of milligrams reaches 2, the drug is to be given again. What is the time between injections?

A. 17.33 hr B. 31.32 hr C. 48.65 hr D. 34.43 hr

Mathematics

Find the quotient  of the complex numbers. Leave answer in polar form.z1 = 6z2 = 12

A.
B.
C.
D.

Mathematics

Use the even-odd properties to find the exact value of the expression. Do not use a calculator.cos (-60°)

A.
B. - 
C. - 
D.

Mathematics