The sum of 9 and twice a number

I need to write this as an algebraic equation.

The unknown number is n

Simplify by combining like terms: - n - 10n - 9n - 3

A triangle area is 60cm^2 and the base is 20cm what is the height

Parker marks sixths on a number line. He writes 5/6 just before 1. What fraction does he write on the first mark to the right of 1?

What is the range of the following? (-1,4), (0,1), (1,2), (1,4) A.) (4,1,4) B.) (-1,0,1,1) C.) (-1,1,2,4) D.) (4,1,2) E.) (-1,0,1)

The link of a garden is 125 of It's with in the garden is 8 m what is the area of the garden.

A grain of sand weighs approximately 0.011 grams. There are approximately 7.5 x 10^18 grains of sand in the world. Using scientific notation, calculate approximately how much all the grains of sand in the world weigh (in grams).

the temperature is - 4°f. A high pressure front increases the temperature to 8°f. by how many degrees did the temperature increases?

2[39 / (16-12*4) + (9+6*3*7]

Find the independent and dependent variables y=x2-24x+3

What is the definition of the determinant