Answer:
-32 + 13 = -19
Step-by-step explanation:
It descends 32 feet, which can be said as -32 feet, and then goes up 13 feet, so you add 13 feet. We can then solve and get -32+13=-19
Answer:
0.2/2 = 0.1, or 10% error
Step-by-step explanation:
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!