Which formula should be used to find the slope of ef? a) x = -b ± b2 - 4ac 2a b) m = y2 - y1 x2 - x1 c) m = y2 + y1 x2 + x1 d) m = (x1 + x2 2 , y1 + y2 2 )

A) The formula x =  -b ± sqrt(b2 - 4ac)/2a calculates the roots of a quadratic equation.

D) The formula M = ((x1 + x2)/2, (y1 + y2)/2) calculates the mid-point of the line joining the points and .

B) The formula m = ((y2 - y1)/(x2 - x1)) calculates the slope of a line.

Hence, option B should be used to find the slope of EF.

Option B -  

Step-by-step explanation:

To find : Which formula should be used to find the slope of EF?

Solution :

The slope formula of two points is given by,

As in given options,

A) is the quadratic formula used to find roots.

B) is the required formula to find the slope.

C)   is not any formula.

D)   is the mid point formula.

Therefore, Option B is correct.

answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0