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Oksana_A [137]
3 years ago
15

How do I solve this?

Mathematics
1 answer:
Katena32 [7]3 years ago
3 0
We’re the problem bro sorry can’t help you bud
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larisa86 [58]

Answer:

about like 8 /10

Step-by-step explanation:

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Ann thought of a number N, multiplied it by 5 and added 7. Then she told the result R to Jim. side note R=5n+7 using the previou
Neporo4naja [7]

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Step-by-step explanation:

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3 years ago
A lighthouse is built on an exposed reef, 4.5 miles off-shore. The shoreline is perfectly straight, and a town is located 6 mile
Alisiya [41]

Answer: 3.94 hours

Step-by-step explanation:

From the question, the following parameters are given:

Distance offshore = 4.5 miles

Distance downshore = 6 miles

Speed when running = 3.4 mph

Speed with boat = 1.8 mph

distance of boat rowing = sqrt(4.5^2 + x^2)

Where

Speed = distance/time

Time = distance/speed

Time = distance of boat rowing/1.8

distance of running = 6 - x

Time = (6-x)/3.4

total travel time

t = sqrt(4.5^2 + x^2)/1.8 + (6 - x)/3.4

dt/dx = x/(1.8×sqrt(4.5^2 + x^2) - 1/3.4

d^2t/dx^2 = +ve at any x

x is at its minimum when dt/dx=0

x/(1.8×sqrt(4.5^2 + x^2) = 1/3.4

x = 6/sqrt(253) × 4.5 = 1.697 miles

Substitute x in

t = sqrt(4.5^2 + x^2)/1.8 + (6 - x)/3.4

We obtaine

t = sqrt(4.5^2 + 1.697^2)/1.8 + (6 - 1.69)/3.4

t = 2.672+ 1.266 = 3.94 hours

7 0
3 years ago
What is the output value of 2x^2-9x-5 input value is x=2
Kobotan [32]

Answer:

-15

Step-by-step explanation:

Go to (Mâthway) This page can help you with problems like that. (replace the â with a when searching the site.)

5 0
2 years ago
andrea rents a bike for 8 hours and pays $42 for the rental tomorrow she wants the same bike but only needs it for 6 hours what
Annette [7]

Answer:

8x=42 where x is hourly cost

so x = 21/4

6*x = 63/2 $

Step-by-step explanation:

5 0
3 years ago
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