22 points )Todd went out for lunch and ordered the taco dinner for $7.95and a soda for $1.50 the total cost included a 6% tax ra
1 answer:
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Answer:
C
Step-by-step explanation:
Add 10x to both sides:
-10x - 135 = 117 + 2x
-10x - 135 + 10x = 117 + 2x + 10x
-135 = 117 + 12x
Subtract 117 from both sides:
-135 - 117 = 117 + 12x - 117
-252 = 12x
Divide both sides by 12:
-21 = x
So the answer is C.
Hope this helps!
Answer:
The third number (c) is 54.
The other ones are 70 and 56.
Step-by-step explanation:
We have 3 numbers, let's call them a, b and c.
We know that the sum of the three numbers is 180, thus:
We also know that the first number is 10 more than the mean of the three numbers <em>(Note: the mean is the sum of the numbers divided by the number of numbers).</em> Thus:
Finally the second number is 4 less than the mean:
Now we have our set of equations and we can proceed to solve them:
Solving for a in our first equation we have: and substituting this in our second equation we have:
Now taking this last result into our first equation we have:
Now we are going to solve for b in our second equation and substitute this in our third equation:
But we know that a =70, so we can substitute it in our last line:
Now we just need to find b and we can use our first original equation to do this: