Solve for x and explain how you got your answer please

-3x -5 = 16

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?