Solve. 40 - 3a = -23

a. a = -0.62

b. a = -21

c. a = 21

d. a = 5.7

solve.
1/5 n +3=6

show your work on the last problem

The first answer is C. I did this by subtracting 40 from both sides which gave me: -3a=-63 Then I divided -3 from both sides which gave me a to equal 21. 

The second answer would be 15. I did this by subtracting 3 from both sides which gave me: 1/5n=3 Then I multiplied by 5 on both sides. I took the reciprocal of 1/5 which is 5 and it gave me n to equal 15.
I hope this helped you! Let me know if you have any questions! 

9514 1404 393

4/13 h ≈ 0.308 h22 9/13 km ≈ 22.7 km

Step-by-step explanation:

Mary and Amaruk are starting 35 -15 = 20 km apart. Their closing speed is 40 +25 = 65 km/h. The time it will take to close the gap between them is ...

  t = (20 km)/(65 km/h) = 20/65 h = 4/13 h ≈ 0.308 h

They will pass each other after 4/13 hours, about 18 minutes 28 seconds.

__

In that time, Mary will have increased her distance from Hall Beach by ...

  d = (4/13 h)(25 km/h) = 100/13 km = 7 9/13 km

Her distance from Hall Beach when she passes Amaruk will be ...

  15 km + 7 9/13 km = 22 9/13 km ≈ 22.7 km . . . . . distance from Hall Beach