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3 years ago

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How to do this question plz answer me step by step plzz plz

1 answer:

faust18 [17]3 years ago

6 0

$\text{Find the perimeter of the track field}\\\\\text{We already have one of our outside value, 50. We can multiply}\\\text{this by 2}\\\\50\cdot2=100\\\\\text{Now we need to find the perimeter, better known as the circumference}\\\text{of the half circle}\\\\\text{Since there is two half circles, we can make one}\\\text{whole circle}\\\text{Use the equation:}\\\\C=\pi \cdot d\\\\\text{Plug in and solve:}\\\\C=\pi \cdot 30\\\\C=94.24778\\\\$

$\text{Add 100 and 94.24778}\\\\100+94.24778= 194.24778\\\\\text{Round to the nearest hundredths place:}\\\\\boxed{\text{194.25 m}}$

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Searches related to Searches related to A motorboat travels 135 kilometers in 3 hours going upstream. It travels 183 kilometers

svetlana [45]

Answer:

$\large \boxed{\sf \text{The rate of the boat is } 53 \ km/h \text{, the rate of the current is }8\ km/h \ \ }$

Step-by-step explanation:

Hello, let's note v the rate of the boat and r the rate of the current. We can write the following

$\dfrac{135}{v-r}=3=\dfrac{183}{v+r}$

It means that

$135(v+r)=183(v-r)\\\\135 v + 135r=183v-183r\\\\\text{ *** We regroup the terms in v on the right and the ones in r to the left***}\\\\(135+183)r=(183-135)v\\\\318r=48v\\\\\text{ *** We divide by 48 both sides ***}\\\\\boxed{v = \dfrac{318}{48} \cdot r= \dfrac{159}{24} \cdot r}$

But we can as well use the second equation:

$3(v+r)=183\\\\v+r=\dfrac{183}{3}=61\\\\\dfrac{159}{24}r+r=61\\\\\dfrac{159+24}{24}r=61\\\\\boxed{r = \dfrac{61*24}{183}=8}$

and then

$\boxed{v=\dfrac{159*8}{24}=53}$

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

5 0

3 years ago

A rectangular pool has a length of 24 feet, a width of 12 feet, and a depth of 8 feet. What is the volume of the pool?

fenix001 [56]

Answer:

multiply opposite side and the answer is ready now because check your soulation

7 0

3 years ago

Write a rational number in fraction form that is equivalent to -1.\overline{5}

lorasvet [3.4K]

Answer:

$\dfrac{-14}{9}$ .

Step-by-step explanation:

The given number is $-1.\overline{5}$ .

We need to find a rational number in fraction form that is equivalent to given number.

Let $x=-1.\overline{5}$

$x=-1.555...$ ...(1)

Multiply both sides by 10.

$10x=-15.555...$ ...(2)

Subtracting (1) from (2), we get

$10x-x=-15.555...-(-1.555...)$

$9x=-14$

Divide both sides by 9.

$x=\dfrac{-14}{9}$

Therefore, the required rational number is $\dfrac{-14}{9}$ .

4 0

3 years ago

Joannie lent $200 to her sister. Four years later, her sister repaid her in full with $228. What simple annual interest rate did

vodomira [7]

Ok, so lets convert all the percents into decimals to help us solve this problem

A 3.0%= 0.03

B 3.5%= 0.035

C 4.0%= 0.04

D 4.5%= 0.045

Now, we can multiply $200 by all the decimals we just converted to see which one will add up to $208

200*0.03= 6-------200+6=206 (this is not equal to 208 so it's not A)

200*0.035=7--------200+7= 207 (Still does not equal 208, so it's not B)

200*0.04= 8---------200+8=208 C is your answer

7 0

3 years ago

3. Find the mean of each group of numbers:

Sever21 [200]

Answer:

1. 27

2. 15

3. 58.4

4. 44.75

5. 40.725

6. 55.88

7. 2.6666666666667

4 0

3 years ago