If

math is troubling you, I can help. I am a former electrical engineer who has spent several years teaching high school math part-time. I hold dual bachelor's degrees in

electrical engineering and

computer engineering, so I am used to using

algebra,

trig,

calculus,

statistics and beyond in both the classroom and the field. If you need help in

physics I can do that too, especially those tricky units on electricity and magnetism. I am currently in the process of transitioning into the actuarial field, so I am well-versed in both

probability and financial

mathematics, and can even help students studying for the preliminary actuarial exams. Prior to moving to northeast PA, I worked as a substitute teacher in Baltimore County, frequently as a long-term sub for teachers who went on sabbatical, disability, maternity leave, etc. Classes I taught long-term in the past include

prealgebra,

algebra 1,

algebra 2,

geometry,

trigonometry,

precalculus, calculus and statistics.

Whether you are in high school or college, I know how difficult it can be to find a truly good math teacher. College professors, who know the subject extremely well, are not really "teachers" and often don't know how to explain it in ways that students understand. High school teachers, on the other hand, are well-trained in teaching techniques, but many math teachers don't have the complete fluency with the subject that's needed to connect the concepts in simple ways or to answer every question that comes up. When I teach, my goal is to give you the best of both worlds. What I bring to the table is not just knowledge of how math works, but why it works the way it does. With this approach, I show students how "complicated" concepts are just combinations of simple pieces. Even the most advanced subjects can ultimately be reduced down to basic arithmetic, and when you approach math this way, you can feel confident tackling even the toughest problems. As both a substitute teacher and a tutor, I've used this approach with great success. On more than one occasion I have had students claim to have learned more math in one day with me than they did during the entire school year up to that point. In one class I was able to bring a failing student up to an A on her final unit test. So as long as you don't quit, I am sure I can help you succeed.

Just remember: "Everything is simple; nothing is easy." -(MY high school math teacher)

Tutors have the ability to create educational resources and share them with the WyzAnt community.
Here are some of the resources created by Justin.
View all of Justin’s resources

The surface area of a sphere is related to the radius by the equation A(r)=4πr². Since you want the rate of change with respect to the radius, just take the derivative of this formula and you get A'(r)=8πr. Then plug 10cm in for r and you will have your
answer.

If the mental math isn't intuitive for you, there's an easy way to remember how to do this. Normally, if you're given a number and have to find a certain percentage of that number, you multiply. For example 35% of 20 would be 20 x .35 = 7. If you're told
that the number you're given is...