Answer:
40 min
Step-by-step explanation:
As unitary method
3.6 miles in 30 min
1 miles in (30÷3.6)=8.333 min
Then
4.8 miles in (4.8×8.33)=40 min.
So to cover 4.8 miles i will take 40 min..
Answer:
The speed of the current is 5 miles per hour.
Step-by-step explanation:
Given, Joy kayaked up the river and then back in a total time of 6 hours.
The trip was 4 miles each way.
The current was difficult.
Let the speed of current be 'a' miles per hour
If joy kayaked at a speed of 5 mph in still water, we have to find what is the speed of the current?
Now, we know that,
distance = speed x time
So,
Then, total time = time for up stream + time for down stream
Now, let us use quadratic formula, to find a value.
Then,
we can neglect – ve values of speed.
A = 5.71
Adding polynomials is just a matter of combining like terms, with some order of operations considerations thrown in. As long as you're careful with the "minus" signs, and don't confuse addition and multiplication, you should do fine.
There are a couple formats for adding and subtracting polynomials, and they hearken back to the two methods you learned for addition and subtract of plain numbers, back when you were in grade school. First, you learned addition "horizontally", like this:
6 + 3 = 9
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That is, you were given relatively small values, and you learned to do the addition — largely in your head, and by working horizontally. We can add polynomials in the same way, grouping any "like" terms and then simplifying the results.
Simplify (2x + 5y) + (3x – 2y)
I'll clear the parentheses first. This is easy to do when adding, because there are no "minus" signs to take through any parentheticals. Then I'll group the like terms in accordance to their variables (keeping them in alphabetical order), and finally I'll simplify:
(2x + 5y) + (3x – 2y)
2x + 5y + 3x – 2y
2x + 3x + 5y – 2y
5x + 3y
These two terms are un-like (because they have different variables), so I cannot combine them. This means that I've gone as far as I can, so my hand-in answer is:
5x + 3y
Answer:
It would be $465 marked up.
Step-by-step explanation:
55% of 300 is 165.
So marked up its 465 and marked down its 135.