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?

For a normal distribution with mean of 35 and standard deviation of 3, compute the following: A. What percent of all observations will fall between 32 and 38? % B. What percent of all observations will fall between 32 and 35? % C.

They've invested to earn $20 in a savings account that offer 3% return on the investment the value of david's investment will be at least $400 after a period of

If u have 3 dice what is the probability that they will all land on the same number

What is 2.5 repeating as a mixed number

For what real value of $v$ is $/frac{-21-/sqrt{301}}{10}$ a root of $5x^2+21x+v$?

Lisa draws a circle by tracing around the bottom of block. which could be the shape of Lisa's block

What value of M gives the system infinitely many solutions? - x+2y=16 Y=mx+8

Maya sells candles to her 5 neighbors. Each neighbor buys 2 boxes of candles. There are 6 candles in each box. What is the total number of candles that all of her neighbors will get?

If you ride your bike for two hours and 45 minutes and you start riding at 11:30 AM at what time will you finish your riding

Find the circumference of a circle whose area is 60 pi centimeter squared