A boat moves at a rate of 40 mph in Stillwater if the rivers current flow in a rate of 4 mph how long does it take a boat to travel 22 miles upstream?
upstream rate: 40 mph - 4 mph = 36 mph
how long: 22 miles/36 mph = 0.6 h = 36 minutes
Hi there!
So, our two equations are:
2x + 3y = 20 and
-2x + y = 4
We can see that the x's will cancel out because they're the same number, opposite signs. Then we're left with 4y = 24.
Divide 24 by 4, which is 6.
y = 6, then we plug that in to the first equation for y:
2x + 3(6) = 20
2x + 18 = 20
2x = 2
x = 1
So, she made her first mistake when adding the equations, adding 20 and 4, she somehow got 16.
The solution to the system is (1,6).
I hope I helped!
Answer:
b
Step-by-step explanation:
y is x + half of x so 12 + 6 is 18
We can solve x + y = 0 for y: y = -x.
This is a polynomial. As with all polynomials, its domain is the set of all real numbers. The range is unlimited and is also the set of all real numbers.
I would greatly appreciate if you can give this the brainliest answer crown!
Step-by-step explanation:
The heights range from 132cm to 162 cm
3 children are taller than 150cm
9 children are shorter than 144cm
149.5cm is the median height
