Find the product. Write the answer in standard form.i(9 - 3i)(5 - 3i)

A. 42 + 36i
B. 9i3 + 42i2 + 45i
C. -42 - 36i
D. 54 + 12i


Answer: A

Mathematics

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Solve the given applied problem.A rectangular area of 2600 ft2 is to be fenced off along the bank of a river; no fence is required along the river. If the material for the fence costs $16 per running foot for the two ends and $15 per running foot for the side parallel to the river, what end length results in a cost of $2380.

A. 100 ft B. 52 ft C. 50 ft D. 25 ft

Mathematics

Find the lump sum deposited today that will yield the same total amount as this yearly payment made at the end of each year for 20 years at the given interest rate, compounded annually.$7000 at 4%

A. $95,111.10 B. $95,132.28 C. $91,937.30 D. $98,204.40

Mathematics

Use a graphing utility to find the discontinuities of the given rational function.f(x) = 

A. -2 B. 3 C. 2 D. The function is continuous for all values of x.

Mathematics

Write the interval notation for the graph. r

A. [r, ?) B. (-r, r) C. (-r, ?) D. (r, ?)

Mathematics