What two numbers multiplies to -225 but adds to 16

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

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?

Aline with a slope of -7 passes through the points (u,0) and (8,-7) what is the value of u?