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yulyashka [42]
2 years ago
11

The amount of time it takes a swimmer to swim a race varies inversely as the average speed of the swimmer. A swimmer finishes a

race in 37.5 seconds with an average speed of 4 feet per second. Find the average speed of the swimmer if it takes 25 seconds to finish the race.
Mathematics
2 answers:
lesantik [10]2 years ago
4 0

Answer:

eeessddsddddddddd

Step-by-step explanation:

ddds

yarga [219]2 years ago
3 0

Answer:

5 average speed

Step-by-step explanation:

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Write the fraction 60/200 as a decimal and as a percent
FromTheMoon [43]

Answer:

0.3

30%

30/100 is the same as 60/200, both the numerator and denominator have been doubled.

5 0
3 years ago
HELP ASAP! I will mark brainlist! Thank you!!
lana [24]
Answer: They form a 90° angle
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2 years ago
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I'm having trouble figuring out how to find the right symbol for this problem √9=6 ? 3​
bearhunter [10]

Answer:

It's a - (minus) sign.

Step-by-step explanation:

This is because √9 is 3, and therefore 6-3=3.

Hope I helped :)

5 0
3 years ago
1)a chord of length 18cm midway the radius of a circle. calculate the radius of the circle correct to 1d.p. 2)if two parallel ch
kykrilka [37]
Part 1:

Given that the length of the chord is 18 cm and the chord is midway the radius of the circle. 

Thus, half the angle formed by the chord at the centre of the circle is given by:

\cos\theta=\frac{\left( \frac{1}{2} r\right)}{r}= \frac{1}{2}  \\  \\ \Rightarrow\theta=\cos^{-1}\left( \frac{1}{2} \right)=60^o

Now, 

\sin60^o= \frac{9}{r}  \\  \\ \Rightarrow r= \frac{9}{\sin60^o} =10.392

Therefore, the radius of the circle is 10.4 cm to 1 d.p.


Part 2I:

Given that the radius of the circle is 10 cm and the length of chord AB is 8 cm. Thus, half the length of the chord is 4cm. Let the distance of the mid-point O to /AB/ be x and half the angle formed by the chord at the centre of the circle be θ, then

\sin\theta= \frac{4}{10} = \frac{2}{5} \\ \\ \theta=\sin^{-1}\left( \frac{2}{5} \right)=23.6^o

Now, 

\cos23.6^o= \frac{x}{10} \\ \\ \Rightarrow x=10\cos23.6^o=9.165\approx9.2cm


Part 2II:

Given that the radius of the circle is 10cm and the angle distended is 80 degrees. Let half the length of chord CD be y, then:

\sin40^o= \frac{y}{10}  \\  \\  \\ \Rightarrow y=10\sin40^o=6.428

Thus, the length of chord CD = 2(6.428) = 12.856 which is approximately 12.9 cm.
3 0
3 years ago
What is the equation of the line that has a slope of 0 and a y-intercept of -2/3
BartSMP [9]

Answer:

y = x  -  \frac{2}{3}

from

y = mx + c

Step-by-step explanation:

since the gradient of the line is 0

8 0
3 years ago
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