jdtech

You might need 1 million apples, but no matter how much you want, you still only have one.

1. The speed of light is 299 792 458 m/s (meters per second)

2. Please use a calculator. Also, I highly doubt that is something you need to find out. I saved you the time, however:  answer = 11111111111088889099999999999999787777987896545245114527563325313467

3. Pi is approximately 3.1415926535897932384626433832795028841971693993751058209749

Google it. The first hit tells you.

No, d = 4, not 4π

In 3πd = 12π, the pi can cancel out (divide from both sides). Then it would just be 3d = 12. Now, just solve like any other algebra equation.

TL;DR: $d = 4$

Use a calculator please

If you mean the penny's value doubles every day, then do this: $0.01*{2}^{30}$

Since $0.01*{2}^{30}$ = 10 737 418.24, the penny would be worth that much in 30 days.

However, you have not specified what the exponent is. So, just replace the base of ${2}^{30}$ with whatever your exponent is. If the penny's value x10 every day, then change it to: ${10}^{30}$

In $0 = 15.3525 / 8 - x$,  x ≈ 1.91906

Note that this is with no brackets

Which scientific calculator are you using? Usually there is a fraction button.

M = 7.3 * pi ≈ 22.934

How I got there: this is a rather simple algebraic problem, steps to solve:

1. Isolate variable, multiplay pi on both sides:  M / pi * pi = 7.3 * pi

2. pi on left side cancels, so you get:  M = 7.3 * pi

3. Solve! The answer is around 22.934