Choose the product of –3y2(–4y3 + y – 9). A. –7y5 – 3y3 – 27y2
B. 12y6 – 3y2 + 27y2
C. 12y6 – 3y2 + 12y2
D. 12y5 – 3y3 + 27y2

D

-3 * (-4) matches, as well as the powers (I guess you wanted to communicate that these are powers, but it would also be correct if these where factors)

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116