Helium atoms have 2 electrons both have a -1 charge. Every proton has a +1 charge. If the helium atom has no charge, how many protons must it have?

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

Plz ( true - false) all triangles have interior angles whose measure sum to 90.