8. Let angle A and angle B be acute angles in two right triangles. Calculate the angle and round to the nearest tenth of a degree.
a. sin A = 0.87
b. cos B = 0.15

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  a. 60.5°

  b. 81.4°

Step-by-step explanation:

Inverse functions are used to find the angle value for a given trig function value.

a) arcsin(0.87) ≈ 60.5°

b) arccos(0.15) ≈ 81.4°

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On many calculators, these functions are accessed using a 2nd or Shift key. They are often labeled as sin⁻¹ and cos⁻¹. The calculator will have a mode setting that needs to be set to "Degrees" if you don't want the angle in radians or grads.

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step-by-step explanation:

1+2+3+4+5+6+7+8+9+10 = 55

2*10 = 20

55-20 = 35

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