Answer:
your answer is below c:
Step-by-step explanation:
<span>It is easier to multiply. For example: 63 multiply by 7
</span><span>63 x 7 = (60+3) x 7 = 60 x 7 + 3 x 7 = 420 + 21 = 441
</span>
Another example : <span>25 x 73
</span>25 x 73 = (20+5) x (70+3) = 20 x 70 + 20x3 + 5x70 + 5x3
= 1400 + 60 + 350 + 15 = 1875
Answer:

Step-by-step explanation:
Let y = m∠Y.
Then 90 - y = the complement of ∠Y
And 3(90 - y) = three times the complement of ∠Y
And 3(90 - y) + 6 = six more than three times the complement of ∠Y.

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