Need help quick ;w; n. 6

The first, second, third, and last ones are correct.

Step-by-step explanation:

The first one is the exact same as the last one, the second one you just square everything, and the third one only squares the x. The fourth one is wrong because that equals 81x^2-y^2. Hope this helps!

= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5

a.)the line for function b is steeper