How many electrons are in the nucleus of an atom with the atomic number of 20

2-digit numbers less than 91 which are 1 less than a multiple of 10

In the diagram below, tan θ = sqrt 3. what is the value of m?

Ifurniture stores having a weekend sale and is offering 20% discount on patio chairs and table the sales tax on furniture is 6.25 using function composition how can you represent the total amount a that you would need to pay for this furniture that cost x dollars