What is the answer for 1.5+(-8.3)

Cody worked 42.5 hours per week in july. this is 12.25 hours more per week than he worked in june.how many hours did cody work per week in june?

Find parametric equations for the line tangent to the curve of intersection of the surfaces at the given point. surfaces: xsquared2plus+2yplus+2zequals=1212 yequals=33 point: left parenthesis 1 comma 3 comma five halves right parenthesis

Pls if a cow has a mass of 9×10^2 kilograms, and a blue whale has a mass of 1.8×10^5 kilograms, which of these statements is true?