If a vertical plane sliced a sphere, what would be the 2-D cross section

These are the answers

1)circle

2)triangle

3)square

4)rectangle

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Find the domain and range of the following function f(x) = 51x - 21+ 4