Select the correct answer. Which expression is equivalent to this polynomial expression?
(2z5 + 3y*)(-4r2 + 9y*)
2r7 + 11r5yt - r2y + 12y8
OA.
O B. 2r10 + 11z5y4 - r'y t 12y16
Oc. -8r? + 18z5y4 - 12r2y+ + 27y8
OD.
-8r7 + 27y8
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If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x