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Rudiy27
2 years ago
12

two speedboats leave the dock at the same time and travel in opposite directions. one travels 9 mi/hr faster than the other. Aft

er 2 hr the boats are 170 mi apart. How fast is each boat travelling ?
Mathematics
1 answer:
Likurg_2 [28]2 years ago
6 0

Answer: \frac{170}{X}+\frac{170}{X-9}=2

(=)17 0x +170x+1530=2x²+18x

(=)-2 x² +322x+1530=0

Δ=b²-4ac

Δ=115924

\sqrt{}Δ=340,476>0

because Δ>0 so that 2 X

=>x₁=2 (true), x₂=-161(false)

X+9= 2+9=11

first travel 2 mi/hr

second travel 11 mi/hr

Step-by-step explanation:

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2 years ago
This is my last question and I need help with it
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I believe the answer is b
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svlad2 [7]
Hello!

Judging on the questions you have provided I have come to the conclusion that to solve all of these you need to find the value of x by isolating it all on one side and simplifying.

For question #1 the first step would be to subtract 6 from each side.
The outcome should be -x=-6-12, and if simplified -x=-18.
Next, you want to divide each side by -1 because x needs to always be positive when finding the solution.
Your answer for #1 should be X=18, D.

For question #2 the first step you should take is to subtract 1.33 from each side to isolate x. 
The outcome should be x=7.82-1.33, and if simplified x=6.49.
Thus your answer for #2 should be X=6.49, A.

For question #3 the first step you should take to approaching the equation is to isolate x by adding 15.99 towards each side of the equation.
The outcome should be x=58.06+15.99, and if simplified x=74.05.
Thus your answer for question #3 should be X=74.05, D.

Lastly, for question #4 the first step you should take towards isolating x is to divide the entire equation by 1.32.
Your outcome should be x= 6.8
Thus, your answer for the last question, #4, should be X=6.8, C.

Hope this helped!
-Blake
8 0
3 years ago
Read 2 more answers
ZX is the perpendicular bisector of wY, and YZ = 13.75. Find wz.
Schach [20]
13.75 + 13.75 = 27.5
27.5 / 2 = 13.75
wz = 13.75
5 0
3 years ago
Help me on this pls.
Mrrafil [7]

Answer:

h.

Step-by-step explanation:

11 / 232 = 0.047

0.047 x 100% = 4.7%

6 0
2 years ago
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