Typing speed is calculated using the formula s= (w-10e)/5 solve the formula for e in terms s and w

So you have s=(w-10e)/5         

To get rid of the 5, multiply the equation by 5, then to the other side.

So now it is 5s=w-10e

Now subtract w. So its now 5s-w=-10e

Now divide the -10. So now it is e=(5s-w)/-10

And it will not simplify because the s and w have different coefficients.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer