2 A and B please with explanation! BIG POINTS please explain

see explanation

Step-by-step explanation:

Using the ratio equality for circles

=

(a)

Note the angle at the centre of the shaded arc is 360° - 90° = 270°, thus

= = ( cross- multiply )

3C = 180 ( divide both sides by 3 )

C = 60 mm

(b)

Note the angle at the centre of the shaded arc is 360° - 135° = 225°, thus

= ( cross- multiply )

225C = 1188 ( divide both sides by 225 )

C = 5.28 cm

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step-by-step explanation:

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.