Answer:
The speed of the boat is 20 km/hr
Step-by-step explanation:
Let s be the speed of boat in still water
Let d be the distance
Upstream speed = s-4
Jane took 30 min to drive her boat upstream to water-ski at her favorite spot.
So, Distance traveled in upstream =
Downstream speed = s+4
So, Distance traveled in downstream = 
So, 
30s-120=20s+80
10s=200
s=20
Hence The speed of the boat is 20 km/hr
Answer:
n=-5
Step-by-step explanation:
first you have to distribute the 3 to the -6 and the 5. In return u will get -18n and 15. then you have to cancel like terms. then you have to add 18 to the 75 which gives you 93. then you divide -18 by 93 which gives you -5.166 repeating... so all you have to do is round. your final answer will be -5.
The answer is b because it is the greater the the other one.
Square root of 4/25 is 0.08
The total surface area is the area of all of the faces of the prism added together.
Rectangles:
2.5 x 10 = 25
1.5 x 10 = 15
2 x 10 = 20
Triangles:
1/2(2 x 1.5) = 1.5
1/2(2 x 1.5) = 1.5
Surface area:
SA = 25 + 15 + 20 + 1.5 + 1.5
SA = 63 m^2
Hope this helps! :)
