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3 years ago

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It takes a motorboat twice as much to cover the distance going upstream as it takes it to cover the same distance going downstre

am. Write the ratio of the speed of the boat in still water to the speed of the current. PLS HELLLPPPP THIS IS DUE IN 3 MINS!!!!!!

2 answers:

Aneli [31]3 years ago

8 0

Answer: Sorry for being late. Hope u passed!

aleksandrvk [35]3 years ago

4 0

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How would I solve 7r=-7/2? I know the answer is -1/2 I just don't understand how to get -1/2 as my answer.

Sonja [21]

$7r=-\dfrac{7}{2}\\
r=-\dfrac{7}{2}\div7\\
r=-\dfrac{7}{2}\cdot\dfrac{1}{7}\\
r=-\dfrac{1}{2}$

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3 years ago

I need help ASAP please I only have a few mins

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3 years ago

Read 2 more answers

You drive from your home to a vacation resort 420 miles away. You return on the same highway. The average velocity on the return

attashe74 [19]

<h2>Time required to complete the round trip $T=\frac{420}{x}+\frac{420}{(x-15)}$ where x is average velocity on the outgoing trip.</h2>

Step-by-step explanation:

Let average velocity of outgoing trip = x mph

The average velocity on the return trip is 15 miles per hour slower than the average velocity on the outgoing trip.

Average velocity of return trip = (x-15) mph

Distance to vacation place = 420 miles

Distance to vacation place = Time for outgoing trip x average velocity of outgoing trip

$420=t_1\times x\\\\t_1=\frac{420}{x}$

Distance to vacation place = Time for return trip x average velocity of return trip

$420=t_2\times (x-15)\\\\t_2=\frac{420}{(x-15)}$

We have total time T = t₁ + t₂

That is

$T=\frac{420}{x}+\frac{420}{(x-15)}$

Time required to complete the round trip $T=\frac{420}{x}+\frac{420}{(x-15)}$ where x is average velocity on the outgoing trip.

8 0

3 years ago

A racecar driver completes a race 30 laps in 15 minutes at a constant speed. what is the driver's speed?

Nataly [62]

Answer:

200 mph/321 km/h if the track is 1 mile long and 100 mph/160 km/h if the track is 2 miles long

Step-by-step explanation:

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3 years ago

Does the function g(x) = -2x2 + 10x + 2 have a minimum or a maximum? Identify its value.<br> +

Hitman42 [59]

Answer:

(5/2, 29/2), and this represents a maximum

Step-by-step explanation:

g(x) = -2x^2 + 10x + 2 is a quadratic function with coefficients {-2, 10, 2}.

The formula for the axis of symmetry (which passes through the vertex) is

x = -b/ [2a]. Here, a = -2; b = 10. Therefore, the axis of symmetry is

x = -10/ [2(-2)] = -10/(-4) = 5/2

Evaluate the function g(x) = -2x^2 + 10x + 2 at x = 5/2 to determine the y-coordinate of the vertex:

g(5/2) = -2(5/2)^2 + 10(5/2) + 2, or

g(5/2) = -2(25/4) + 25 + 2, or

g(5/2) = -25/2 + 27, or

g(5/2) = 14.5

The vertex is thus (5/2, 29/2), and this represents a maximum, because the coefficient of the x^2 term is negative (the curve opens downward).

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3 years ago