How do know how many protons are in a atom

Last week christi spent 2 3/4 hours playing piano this week she spent 3 2/4 hours playing the piano how much more time did she play the piano this week

Write the ratio as a fraction in simplest from with whole numbers in the numerator and denominator 35: 10

How to solve 7/15+2/5=

Since heat touching the surface of an ice cube causes it to melt, is it better for an ice cube to have a large surface area or a small surface area? I'm thinking that the bigger the surface area the slower it will melt am I right

How many solutions does 6-3x=4-x-3-2x have?

Given that the employed adult is male, what is the probability that he felt tense or stressed out at work

How many times would it take to walk 1,000,000 yards in a park that is 150 yards on one side and 125 on the other

8y-36 factor the expression complete

Find the volume of a box that will hold nine 9.425 cm3 cylindrical containers that each measure 3 centimeters long. (round to nearest whole number)

What is the explicit formula for this sequence? 2, 10, 50,250, 1250 ...