10 points and explain -32.48-(14.014)

Find the solution of this system of equation -7x+y=-20 9x-3y=36

One astronomical unit (1 au) is about 1.496 alt tag missing. kilometers. if you wrote this number of kilometers in regular decimal notation (for example, 528 and 3,459 are written in regular decimal notation), how many zeros would your number have?

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)