Calcium has an atomic number of 20 and an atomic mass (weight) of 40. Therefore, we know that calcium has 20 protons
40 protons
40 electrons
20 neutrons
20 electrons

select all that apply

Nick and nora are married and have three children in college. they have an adjusted gross income of 47,400. if their standard deduction is 12,600 itemized deductions are 14,200 and they get an exemption of 4000 for each adult and each dependent what is their taxable income

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10