I need help with this problem please

x=5

Step-by-step explanation:

The midsegment of a trapezoid is equal to the sum of the two bases divided by two. This means that 17 = (2x + 1 + 3x + 8)/2. To start, multiply both sides by 2 to get 34 = 2x + 1 + 3x + 8. Next, combine like terms to get 34 = 5x + 9. Subtract 9 from both sides for 25 = 5x. Finally, divide both sides by 5 to get an x-value of 5.

answer: 12

step-by-step explanation:

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: