tomsun

D=RT
180=(R-C)10
180=10R-10C DIVIDE BY 2 & ADD.
180=(R+C)5
180=5R+5C
90=5R-5C
---------------
270=10R
R=270/10
R=27 MPH. ANS. FOR THE RATE OF THE BOAT.
180=(27-C)10
180=270-10C
10C=270-180
10C=90
C=90/10
C=9 MPH. ANS.FOR THE CURRENT.
PROOF:
180(27+9)5
180=36*5
180=180

credited to checkley79

Setting up 2 equations:

\(y=x+21\)

\(y=4x\)

\(4x=x+21\)

\(3x=21\)

\(x=7\)

\(y=28\)

x=time and y=distance

The answer: it takes 7 seconds and the adults go 28 meters

post deleted. 

sorry, I put the wrong answer

hint: brute force means every possible route was calculated. So, figure out how many routes are possible with seven cities, divide the time by that, and that gives you how much time it takes to calculate a single route with 7 cities.

divide the time for an individual route by 7 and that tells you how much time it takes to evaluate an individual route per 1 city.

Multiply that by 11, you get the time it takes to measure an 11 city route.

With that, all you need is the number of routes in 11 cities, multiply that by the time to calculate each route, and you're good.

I have to say that you asked too many questions.

most of the questions u asked can be easily solved by using a simple google search or a Calculator. 

\(2L + 2(L − 2.5) = 56\)

\(2L+2L-5=56\)

\(4L=64\)

\(L=16\)

OKay. Let's get started.

we will make a system of equations.

s for students.

\(6s + 27s − 45 = 1,374\)

\(27s+6s=1374+45\)-- add 45 to both sides.

\(33s=1419\)-- combine like-terms.

\(s=43\)

I *agree*, but I like to answer directly because there is always a possibility that the person doesn't know how to solve it.

As you said, this question is easy and the guest doesn't know how to do it, so that means the guest might not know how to solve the equation as well.

The answer is D.

I also explained on https://web2.0calc.com/questions/help_1360

Thank you Impasta and Guest.

I will start from the place where Impasta and the Guest left out.

\(2t+5=13\)

\(2t=13-5\)

\(2t=8\)

\(t=4\)

The answer is: Tony has 4 kills.