To be divisible by 63, it must be divisible by both 7 and 9, since 7x9 = 63. Factor the expression, simplify, and see if both 7 and 9 are factors, which would make it divisible by both 7 and 9. (163 - 83)(43 + 23) = [(24)3 - (23)3] [(22)3 + 23] = (212 - 29)(26 + 23) = [29(23 - 1)] [23(23 + 1)] = [29(8 - 1)] [23(8 + 1)] = 29(7) 23 (9) = 63(212) It is a multiple of 63, and hence divisible by 63.
A+b=100
a-b=6 ⇒ a= b+6
(b+6)+b=100
2b+6=100
2b=100-6
2b=94
b=94:2
b=47
a=47+6
a=53
Answer:
Your answer would be D
Step-by-step explanation:
Answer:
m = 4/3
Step-by-step explanation:
Step 1: Write equation
Step 2: Solve for <em>m</em>
- Cross multiply: 6m = 8
- Divide both sides by 6: m = 8/6
- Simplify: m = 4/3
<span>1/2mile every 1/4 hour
</span><span>
1/2mile -------------------> 1/4 hour
??n mile -----------------> 1 hour
cross multiplication
1 x 1/ 2 / 1/4 = 2 miles
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