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Kitty [74]
3 years ago
7

H=(-5) answer needed now!!!!

Mathematics
1 answer:
wariber [46]3 years ago
7 0

Answer:

-2

Step-by-step explanation:

h(-5) represents the y value when x is -5.

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A boat travels 12 km upstream and back in 1 hour 45 minutes. If the speed of the current is 3 km/h throughout, find the speed of
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Answer:

14.3 km/h   to 3 significant figures

Step-by-step explanation:

Let time travelling upstream be t1 hours and downstream = t2 hours.

t1 + t2 = 1.75..........................(1)

Let v  be the speed of the boat in still water.

12 / t1 = v - 3.........................(2)

12 /  t2 = v + 3........................(3)

From (1) and (3) , substituting for t2:-

12 / (1.75 - t1) = v + 3 ..................(4)

Subtract:-   (2) - (4):-

12 / t1 - 12 / (1.75 - t1) = -6

12(1 .75 - t1) - 12t1 = -6t1(1.75 -  t1)

21 - 12t1 - 12t1 = -10.5t1 + 6t^2

6t1^2 + 13.5t1 - 21 = 0

Solving this gives t1 = 1.058 hours

Therefore the speed in still water (v)  = 12/1.058 + 3 = 14.3 to 3 sig figs

3 0
3 years ago
Question 5 of 10
Hitman42 [59]

Answer:

a

Step-by-step explanation:

4 0
2 years ago
Who want to help ???
Fiesta28 [93]
For a set of trials P_{desired}=\frac{desired}{total}. In this case our desired out come is all multiples of 3: 3,6,9 and 12. The total number of outcomes can be found as 100 by adding up all the frequencies. Thus our experimental probability is P_{x=3n}=\frac{6+14+12+1}{100}=\frac{33}{100}=33\%.
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3 years ago
A trampoline has an area of 49 times pie square feet. what is the diameter of the trampoline?
zimovet [89]

153.0957135885=49*pie


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Paul and five friends each sold the same number of tickets. They sold 54 tickets altogether. How many tickets did each person se
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Step-by-step explanation:

It's 54÷6 which equals 8

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