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monitta
3 years ago
15

Sarah jumps rope to keep in shape. She jumps an average of 20 times in 15 seconds. Which of these describes her jumping rate?

Mathematics
2 answers:
Paraphin [41]3 years ago
8 0

Answer:

80 jumps per minute

bearhunter [10]3 years ago
8 0
80 is the correct answer
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Frank and Dwayne weed their gardens that are the same size. Frank's garden is divided into 6 equal sections. Dwayne's garden is
cricket20 [7]
2/6 or 1/3 and 2/4 or 1/2 Dwayne weeded a larger area cause he had 4 bigger sections and he did half
7 0
3 years ago
Solve the system of equations using (a) substitution and (b) Elimination
Oxana [17]

Answer:


Step-by-step explanation:

huh i think the answer is 9


4 0
3 years ago
A boat traveled 120 miles downstream and back. The trip down stream took four hours. The trip back took 12 hours. Find the speed
Alexxandr [17]
When the boat travels downstream, the current helps it move faster because it works in the direction of travel. When the boat moves upstream, the opposite happens. So, let s be the speed of the boat in still water and c be the speed of the current, both in miles per hour.

Remember that rate * time = distance. Let's use this formula to write what happens when the boat is going downstream and upstream. When the boat goes downstream, the current goes in the same direction as the boat and speeds it up, so the rate is given by s + c. When the boat is going upstream, the current goes against the boat's movement and slows it down, so the rate is s - c. Thus,

Upstream: (s + c)(4 h.) = 120 mi.
Downstream: (s - c)(12 h.) = 120 mi.

This is now a system of equations. Let's first divide both sides of each equation by the time to get everything in miles per hour:

\left \{ {{s + c = 30 mph} \atop {s - c = 10 mph}} \right.

We can then add the two equations and solve for the speed of the boat in still water first:

(s + c) + (s - c) = 30 mph + 10 mph
2s = 40 mph
\bf s = 20 mph

Finally, we can find the speed of the current by plugging the speed of the boat back into one of the previous equations:

s + c = 30 mph
20 mph + c = 30 mph
\bf c = 10 mph
7 0
4 years ago
Hello,
oksano4ka [1.4K]

It took him 9.92 hours to complete the journey.

Step-by-step explanation:

Given,

Distance traveled = 50 miles

Distance traveled on horse = \frac{50}{2}=25\ miles

Distance traveled on foot = 25 miles

Speed while riding = 9 miles per hour

Distance = Speed * Time

Time while riding = \frac{Distance}{Speed}

Time while riding = \frac{25}{9}=2.78\ hours

Speed while waling = 3.5 miles

Time = \frac{25}{3.5}=7.14\ hours

Total time = 2.78+7.14 = 9.92 hours

It took him 9.92 hours to complete the journey.

Keywords: speed, distance

Learn more about distance at:

  • brainly.com/question/10552347
  • brainly.com/question/10570041

#LearnwithBrainly

7 0
3 years ago
Căn bậc hai số học của 9 là<br> A. 3−. B. 3. C. 81. D. 81−.
Fynjy0 [20]

Answer:

ko biet

Step-by-step explanation:

4 0
3 years ago
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