Mika is filling her fish tank. there are 8 gallons of water in the tank when she starts filling it. she is adding 4 gallons of water per minute. the tank can hold 20 gallons. which inequality shows how many minutes (m) mika can fill the tank without overflowing? (answer choices a. m ≥ 3 b. m ≥ 7 c. m 3 d. m 7)

C. 3 MINUTES

Step-by-step explanation:

FIRST THE AMOUNT OF WATER WAS 8 GALLONS.

THE TANK CAN HOLD 20 GALLONS OF WATER.

TANK LEFT TO BE FILLED IS 12 GALLONS.

4 GALLONS PER MINUTE

SO,12/3=4

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.