Answer:
Step-by-step explanation:So we know x + y = 21 and 5x +10y = 165 We line them up in columns x + y = 21 5x +10y = 165 To eliminate the x variable, I'll multiply every element in the 1st equation by -5. -5x + -5y = -105 5x + 10y = 165 Now we combine (add) the equations, which eliminates x altogether. 5y = 60 ... y = 12 From there, x + 12 = 21 ... x = 21-12 ... x = 9 You should double check. Do 9 nickles and 12 dimes equal $1.65? A very important thing to remember using this method is to do the same thing to each element in the equation that you change! I hope that helps.
Answer:
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Step-by-step explanation:
(4^9)^5 is equal to 4^45. You multiply 9 and 5 to get 45.
A because it’s the first one I saw and it looks correct
n > 13
Step-by-step explanation:
n-8> 5=
Add 8 to both sides.
n > 5 + 8
Add 5 and 8 to get 13.
<u>n > 13</u>
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Please mark as brainliest