R-7=7 add the seven from both sides, leaving the r alone, because this is what you are trying to find. Thus the answer is r=14.
Answer:show the table so I can help
Step-by-step explanation:
1+2+3+... +n=
((1+n) x n) /2
is that the things you want
Robin’s number ------------ Y
Sydney’s number ------------ x
Y = X + 8.............. (1)
X + Y = 72 ............(2)
Substituting (1) in (2)
X + (X + 8) = 72 .............> ......2X = 64 => X = 32
Now in (1)
Y = (32) + 8 = 40
Robin is 40
Sydney is 32
At the end of the third day, the new reading on the odometer will be 12,578 mi
<h3>
What will the odometer reading at the end of the third day?</h3>
The initial odometer reading is 12,386 miles.
Then, the driver takes drives to and from work, such that each trip is 32 miles. Then each day he drives 2*2mi = 64 miles.
And he does this for 3 days, then the total distance driven is:
3*64mi = 192 miles.
At the end of the third day, the new reading on the odometer will be:
R = 12,386 mi + 192mi = 12,578 mi
If you want to learn more about distance:
brainly.com/question/7243416
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