Answer:
9
Step-by-step explanation:
Let's say Mark is M and his brother is B.
M+5=B
M+B=23
Now we can solve using subsitution.
M+M+5=23
(Subtract 5 from both sides)
2M=18
M=9
Hope this helped!
First, subtract 2/3 from both sides and you get

Then multiply both sides by 6/5 and you get
Hello,
if the solution is infinite : the line x-3y=4 ,
so there is one line and not 2
==>x-3y=4 multiplied by 2
2x-6y=8=Q
Q=8
Answer:
195 feet.
Step-by-step explanation:
multiply 30 x 6.5.
Answer:
25 minutes and 33 seconds
Step-by-step explanation:
please brainiest