Solve: 10 sin^2(x) - 3sin(x) - 1 = 0 let u=sin(x)

The given equation is equivalent to which one below?

(2u-1)(5u+1)=0
(10u+1)(u-1)=0
(5u-1)(2u-1)=0

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Solve 2x2 + 8 = 0 by graphing the related function. there are two solutions: . there are no real number solutions. there are two solutions: 2 and -2

Aplot of land has been surveyed for a new housing development with borders ab, bc, dc, and da. the plot of land is a right trapezoid with a height of 60 feet and an opposite leg length of 65 feet