PLEASE HELP ASAP IT'S DUE NOW I WAS UP ALL NIGHT TRYING BUT I CAN'T UNDERSTAND IT I'LL GIVE BRAINLIST TO THE FIRST CORRECT ANSWER​

Step-by-step explanation:

Angle 1 - (5a + 18)°

Angle 2 - (48 - a)°

Angle 3 - (8a - 30)°

Sum Of All Angles = 180° [Angle of Straight Line]

Therefore,

180 = (5a + 18) + (48 - a) + (8a - 30)

180 = 12a + 36

144 = 12 a

12 = a

Applying Value of a in Angles 1, 2 and 3,

Angle 1 - 5 (12) + 18 = 78°

Angle 2 - 48 - 12 = 36°

Angle 3 - 8 (12) - 30 = 66°

Therefore Biggest Angle is Angle 1 -78°

Hope I Helped,

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step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2

answer: it's d

step-by-step explanation: