16-8n=5-9n add 9n to both sides
16+n=5 subtract 16 from both sides
n=-11
check...
16-(8*-11)=5-(9*-11)
16-(-88)=5-(-99)
16+88=5+99
104=104
10(1 + 4a) - 7a = -6a + 5(1 + 8a)
10 + 40a - 7a = -6a + 5 + 40a
-40. -40
10 - 7a = -6a + 5
-7a + 6a = 5 - 10
-a = -5
5 = a
Answer:277.5
Explanation: If 185 calories=2 miles then 1 mile=92.5 calories. 185+92.5=277.5
Use the Pythagorean Theorem. a^2+ b^2=c^2.
In this case, it is c^2-b^2=a^2, so your answer is 4.686 mm^2. Round if you need to.
It would be the third one !!!!!!!!!
