1. The measures of the angles in a triangle are x, 2x, and 2x - 20. What is the measure of the largest angle?

Sum of the three angles of a triangle = 180 degrees

x+x+20+2 x=180

4 x=160

x=40

The angles are 40,(40+20).(2*40)

Answer 40,60,80

the answer is 62.8 cubic units

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116