The expression mc031-1.jpggives the thickness in millimeters (mm) of the insulation needed for a high voltage cable. mc031-2.jpg is the number of kilovolts carried by the cable. what thickness of insulation material is needed for 7 kilovolt cable?

Basically your equation looks like this T=.01E + .003E^2 T = thickness and E = kilovolts carred by the cable If you want T, and we know the cable carries 1 kilovolt, then all we do if plug in our 1 for E so... T = .01(1) + .003(1)^2

Wish I could help a little more... could you give a little more info on this? 

No because if you do the higher number minus the lower number you will get a positive. if you do it the other way around you will get a negative number

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.