7. 15 can be written as
507 + 10)
7(10 + 5)
10(7 + 5)

7(10+5)

Step-by-step explanation:

When simplified, it's the only one that can go.

507+10)= 517, so, NO

10(7+5) = 10(12) = 10 . 12, so, NO

7(10+5) = 10(15) = 10 . 15, so, YES

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∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°