In ΔABC, a = 660 cm, b = 680 cm and c=100 cm. Find the measure of ∠B to the nearest degree.

m∠B = .

Step-by-step explanation:

Since the three sides of the triangle are given, then we apply cosine rule.

= + - 2ac Cos B

But, a = 660 cm, b = 680 cm, and c = 100 cm.

So that;

= + -2(660 x 100) Cos B

462400 = 435600 + 10000 - 132000 Cos B

462400 = 445600 - 132000 Cos B

132000 Cos B = 445600 - 462400

                        = -16800

Cos B =

         = -0.1273

B = -0.1273

  =

Thus, measure of ∠B is .

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.

step-by-step explanation: s