PLZ help BRAINLIEST 5 STARS THANKS AND POINTS

9514 1404 393

  (A, B, C, D) = (84°, 112°, 136°, 28°)

Step-by-step explanation:

The degree measures of the angles in terms of x are ...

  A = 3x

  B = 4x

  C = 4x +24

  D = x

The sum of the angle measures is 360 degrees, so we have ...

  A +B +C +D = 360

  3x +4x +(4x+24) +x = 360

  12x = 336 . . . . subtract 24, collect terms

  x = 28 . . . . . . . divide by 12

Then the angle measures are ...

  m∠A = 3·28° = 84°

  m∠B = 4·28° = 112°

  m∠C = 112°+24° = 136°

  m∠D = 28°

answer: a

step-by-step explanation:

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a