**Answer:**

see explanation

**Step-by-step explanation:**

Nicole has the correct equation

To find ∠ F use the Sine rule, that is

The ratio of the sine of an angle to the side opposite is equal to the ratio of the sine of another angle to the side opposite.

Matthew and Leah have mixed up the sine of an angle with the incorrect opposite side.

Following on with Nicole's solution

= ( cross- multiply )

27 × sinF = 19 × sin100° ( divide both sides by 27 )

sinF = ≈ 0.6930, thus

F = (0.6930 ) ≈ 43.9° ( to 1 dec. place )

**Answer:**

I can give you some examples of inverse operations:

addition is the inverse operation of subtraction

multiplication is the inverse operation of division

taking the square root is the inverse operation of squaring

6.64

- 1.35

= 5.29

To the nearest tenth it is 5.3 times more miles of coastline.