△PQR and △RST are shown. Triangles P Q R and S T R share point R. P R and Q R are congruent and T R and S T are congruent.

What is m∠TSR?

m∠TSR =

What is the value of  y  in the solution to the system of equations? x  +  y  =  12x  –  3y  =  –30a. –8b. –3c. 3d. 8

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

What is the standard form of -5x^2+2x^4-11+x^3+3x