Ineed with number 6 someone work it out need to show work

If I read this diagram correctly then

DE   9x - 31 y    implies that the slope y / x = 9/31 = .29

and arctan .29 = 16 deg

and line CD  7x - 2y  implies that slope y / x = 7/2 = 3.5

and arctan 3.5 = 74 deg  

So in that interpretation the difference is 58 deg

But, I'm not certain of the terminology being used.

b

step-by-step explanation:

the total is 23.97. 0.25% is off so you have to subtracting 25% from 100% and you will get 75% if you convert it to decimal you will get 0.75. you have to find the original because the formula is % times original = total.so you have the total and the % so you just have to plug it in.

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)