Let x be the speed of the motorboat and y be the speed of the current.
Then, for downstream, the speed is x + y.
Now, speed = distance/time.
Distance = 80 miles.
Time for downstream = 4 hours.
So, x + y = 80/4 = 20 (1)
Against the current, that is for upstream, the speed is x - y.
Time for upstream = 5 hours.
x - y = 80/5 = 16 (2)
Adding (1) and (2), we get,
2x = 36
x = 18
Hence, rate of the motorboat in calm water = 18 miles/hour.
Answer:
a.
b.
Step-by-step explanation:
a. You know that the dimensions of Rectangle A are
Since Rectangle B’s dimensions are (which is 0.6 cm) larger than Rectangle A’s dimensions, then the dimensions of Rectangle B are:
Since Rectangle C’s dimensions are (which is 0.6 cm) larger than Rectangle B's dimensions, then the dimensions of Rectangle C are:
The find the total area of all three rectangles you must add the products obtained when you multiply their dimensions. Then:
b. The perimeter of a rectangle can be calculated with this formula:
Where "l" is the lenght and "w" is the width.
Knowing the dimensions of each rectangleg, you can calculate the total perimeter as follows:
Then, if a 40-cm coil of wire was used to form the rectangles, the amount of wire that is left is:
Answer:
refer to the attachment hope it helps
The exact value of r would be 6.
Hope this helps.
Hi there!
To solve this problem, we need to multiply each of the sides of the rectangular base together.
8 × 4 × 4 1/2 = 144
The volume of the base is 144 in cubed.
Hope this helps!