Can someone just tell me if these answers are right?

Write thw equation of the line that it is perpendicular to y=7x-3 and passes through the origin

50 gallons of 70% acid solution are obtained by mixing and 80% solution with a 50% solution. How many gallons of each solution must be used to obtain the desired mixture?

Word problem that has answer of 14.80.

Eight people compete in a downhill ski race assuming that there are no ties in how many different orders can skiers finish

What is the coefficient in the expression x-27?

Name the corresponding part if ∆RST ≅ ∆WXY ∠R= ∠X ∠W ∠Y

Given the function f (x) = 9-2x, find x when f (x) = 25 -41 17 -8

What is the answer to this equation 1/2 (10x-20) = 5x-10

The sum of four times a number and 1 is equal to three times the number

If the perimeter of the adult pinball machine is 172 inches, what is the length, in inches of G' A '?