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3 years ago

13

Athletes use jump rope as a way to warm up before exercise. If an athlete jumps 350 times in 8 minutes, what is their average ra

te of jumps per minute?

1 answer:

OLga [1]3 years ago

5 0

Answer:

about 44 jumps per minute

Step-by-step explanation:

350/8=43.75

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Two trains started moving at the same time, train A from Boston to New York, and train B from New York to Boston. The distance b

Ede4ka [16]

Answer:

<u>After 1.7 hours</u>

Explanation:

<u>1. Calculate the average speed of train B</u>

60mph = 3/4 (s) ⇒ s = 60 (4/3) mph = 80 mph

<u>2. Build a table</u>

When the two trains meet:

Train Average speed Distance time (distance/average speed)

mph

A 60 x x/60

B 80 240 - x (240 - x) / 80

<u>3. Write the equation</u>

The time, when the two trains meet, is the same for both trains:

$\dfrac{x}{60}=\dfrac{240-x}{80}\\ \\ \\ 80x=14,400-60x\\ \\ 80x+60x=14,400\\ \\ 140x=14,400\\ \\ x=14,400/140\\ \\ x=102.85miles$

<u>4. Calculate the time:</u>

x/60 = 102.86 / 60 = 1.7 hours

The two trains will meet after 1.7 hours

7 0

3 years ago

Multiply : 1 2/5 x 1/4

777dan777 [17]

Answer:

0.35

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Which of the following is the solution to the differentiable equation dy/dx=4x/y, where Y(2)=-2

aliya0001 [1]

First we'll substitute $\frac{dy}{dx}$ with $y'$

$y'=\frac{4x}{y}$

Then we can separate this.

$yy'=4x$

Then we'll solve this.

$yy'=4x: \frac{y^2}{2}=2x^2+c_1$

$\frac{y^2}{2}=2x^2-6$

$y=2\sqrt{x^2-3},y=-2\sqrt{x^2-3}$

Then we'll plug in to find the extraneous solutions (if any)

$y=-2\sqrt{x^2-3}$

7 0

3 years ago

Least to greatest 1.3, -3/2, -1.2, 1 1/2

lbvjy [14]

1. -3/2
2. -1/2
3. 1.3
4. 1 1/2

5 0

3 years ago

(143(5) + 67)5-----------Anybody???:)

Vikentia [17]

<span>(143(5) + 67)5
Multiply 143 by 5
(715 + 67)5
Add the numbers inside the parenthesis(715 and 67).
(782)5
Multiply 782 by 5.
Final Answer: 3,910</span>

6 0

3 years ago