The slope of the line through points c (-3,-7) and d (3,a^2+1) is 1/2a^2 find the value of amidpoint= (x^1+x^2, y^1+y^2)

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny