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3 years ago

What is the value of (4x2-10)/y when x=5 and y=6 A. –15 B. 10 C. 15 D. 20

Mathematics

1 answer:

Simora [160]3 years ago

8 0

Answer: C. 15

Step-by-step explanation:

Good Luck!

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It takes 32 hours for a motorboat moving downriver to get from pier A to pier B. The return journey takes 48 hours. How long doe

lina2011 [118]

Answer:

Time taken by the un powered raft to cover this distance is T = 192.12 hr

Step-by-step explanation:

Let speed of boat = u $\frac{km}{hr}$

Speed of current = v $\frac{km}{hr}$

Let distance between A & B = 100 km

Time taken in downstream = 32 hours

$32 = \frac{100}{u +v}$

$u + v = \frac{100}{32}$

u + v = 3.125 ------ (1)

Time taken in upstream = 48 hours

$48 = \frac{100}{u -v}$

$u -v = \frac{100}{48}$

u - v = 2.084 ------- (2)

By solving equation (1) & (2)

u = 2.6045 $\frac{km}{hr}$

v = 0.5205 $\frac{km}{hr}$

Now the time taken by the un powered raft to cover this distance

$T = \frac{100}{v}$

Because un powered raft travel with the speed of the current.

$T = \frac{100}{0.5205}$

T = 192.12 hr

Therefore the time taken by the un powered raft to cover this distance is

T = 192.12 hr

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3 years ago

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A trailer will be used to transport several 50 kilogram crates to a store. The greatest amount of weight that can be loaded on t

Maslowich

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50 kg

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3 years ago

What is the equation of the line shown in this graph?

san4es73 [151]

Answer:

y=-3

Step-by-step explanation:according to the graph, for all values of x, y is equal to -3, so this function is independent of the variable x, so the equation is y=-3 (constant for all values of the Real numbers)

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What is the average speed between 2 seconds and 8 seconds.

Gennadij [26K]

Add the two speeds together, then divide the two, this gives the average speed. Hope this was helpful!

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ivolga24 [154]

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Step-by-step explanation:

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