What is the sum of the first four composte numbers?

19

20

27

28

27

Step-by-step explanation:

The first four composite numbers are - 4, 6, 8, 9.

Add these all together and you get 27. Hope it helps!

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  

a² + b²= c²

24² + 7² = c²

c= 25