Billy purchased four more oranges than apples. Apples cost 30 cents each and oranges cost 50 cents each. Billy spent a total of $3.60. Write an equation, to find how many apples, a, he purchased.

0.30a + 0.50 (4+a) = 3.60

Step-by-step explanation:

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  

1/4 because there is 4 grades.