A calcium ion has 20 protons and 18 electrons. Each proton has a + 1 charge and each electron has a - 1 charge. What is the charge of the calcium ion?

I can use the calculator to find 28 is what percent of 58,230. How do I show the math? Divide 28 by 58230?

How do you write the equation of a circle with the center (6,2) and radius r=8?

Simone peeled 14 potatoes in 1/5 hour. At this rate, how many potatoes can Simone peel in one hour?

Which of the following is a factor of both X^2-2x-3 and x^2-5x-6? Answer choices: A. X-3 B. X+3 C. X-1 D. x+1

Which property of equality would you use to solve the equation 2x=5

Which choice represents the solution for x2 = 676? A) x = 16 B) x = 676 C) x = ± 16 D) x = ± 676

Find all zeros of the function and write the polynomial as a product of linear factors. f (x) = 3x4 + 4x3 + 13x2 + 16x + 4

Which sentence is the most accurate definition of an identity? An identity is an equation that is true for all real numbers. An identity is an equation that is true for all real values in its domain.

How do I simplify - 5 (3p+3) + 9 (-7+p)

Round each number to the place indicated. Draw a number line to support your decision. 1. 0.235; Round to the nearest tenth 2. 3.492; Round to the nearest hundredth 3. 8.0769; Round to the nearest thousandth