Answer: Use the slope formula to find the slope
m = −2−b/2
28.7083333333...
But you could also round it up to 29.
ANSWER
B. The two middle coefficients add to the correct number but do not multiply to the correct number.
EXPLANATION
The given quadratic trinomial that Tina tries to factor is

Comparing to

we have a=10, b=-13 and c=-3
ac=-3×10=-30
We split the middle term so that their sum is -13.
Tina use
-10,-3
to get
-10x-3x
The sum is -13x alright but the product is not -30.
B is correct.
I'm confused on what you're asking, but this is scientific notation on the first one of 0.0000855. 8.55 x 10^-5