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Marta_Voda [28]
2 years ago
6

Can someone please answer this and EXPLAIN how to solve it? ill mark brainliest.

Mathematics
2 answers:
iragen [17]2 years ago
7 0

Answer:

254.34 in^2

Step-by-step explanation:

Replace de values on the formula

a = \pi {r}^{2}  \\ a = (3.14)(9)^{2}  \\ a = 254.34

Nataliya [291]2 years ago
6 0
Answer is 254.47 in^2
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Ostrovityanka [42]
14 because the decimal place has to be greater than 5. If it's above you round up, below you round down.
5 0
3 years ago
Donald's car gets about 30 miles per gallon. About how many miles can Donald drive on 9.2 gallons of gas? At $3.15 a gallon, abo
denis-greek [22]
<span>30x9.2= 276 miles 9.2x3.15=$28.98 So the car can drive 276 miles if you put $28.98 of gas in it.</span>
8 0
3 years ago
Ben, Tim, and Sam have to do a certain job. Ben can finish the job in 5 hours. Tim can finish the job in 6 hours. Sam can finish
Brut [27]

x is 7.5 hours

Step-by-step explanation:

Ben, Tim, and Sam have to do a certain job

  • Ben can finish the job in 5 hours
  • Tim can finish the job in 6 hours
  • Sam can finish the job in x hours
  • The three of them can finish the job in 2 hours if they work together

We need to find x

∵ Ben can finish the job in 5 hours

∴ The rate of Ben = \frac{1}{5}

∵ Tim can finish the job in 6 hours

∴ The rate of Tim = \frac{1}{6}

∵ Sam can finish the job in x hours

∴ The rate of Sam = \frac{1}{x}

They will working together to finish the job in two hours, that means the sum of their rate is equal to 1/2

∵ They can finish the job in 2 hours if they work together

∴ \frac{1}{5}+\frac{1}{6}+\frac{1}{x}=\frac{1}{2}

To add the fractions find the LCM for all denominators to make all fractions with same denominators

∵ The LCM of 5, 6 ans x is (5 × 6 × x) = 30 x,

- Divide it by each denominator to find the new numerators

∵ 30 x ÷ 5 = 6 x , 30 x ÷ 6 = 5 x , 30 x ÷ x = 30

- Change all the denominators to 30 x and then write the new

   numerators of each fraction

∴ \frac{6x}{30x}+\frac{5x}{30x}+\frac{30}{30x}=\frac{1}{2}

Add the numerators and put the sum over 30 x

∵ \frac{11x+30}{30x}=\frac{1}{2}

- By using cross multiplication

∴ 2(11 x + 30) = 1(30 x)

- Simplify the both sides

∴ 22 x + 60 = 30 x

- Subtract 22 x from both sides

∴ 60 = 8 x

- Divide both sides by 8

∴ 7.5 = x

∴ The value of x is 7.5 hours

x is 7.5 hours

Learn more:

You can learn more about the word problems in brainly.com/question/10712420

#LearnwithBrainly

5 0
3 years ago
In a class of 29 students, 9 play an instrument and 23 play a sport. There are5
GenaCL600 [577]

Answer:

5/23

Step-by-step explanation:

23 play a sport and 5 play both an instrument and a sport so 5 out of 23 play an instrument given that they play a sport

3 0
2 years ago
Im confused <br><br><br> khan academy 8th grade
Anit [1.1K]

Answer:

14

Step-by-step explanation:

hi! so the question is asking what h is when you input -18 for x, right?

inputing in this question means to substitute, meaning that in this equation, -18 will take the place of x!

  • let's see what the equation looks like now
  • h = 17 + \frac{-18}{6}
  • easy as that!

now let's do the math :)

  • because of PEMDAS, remember to do the fraction (dividing) first!
  • h = 17 + (-3)

we can change that to --> h = 17 - 3

h = 14

let me know if you're still confused!

7 0
2 years ago
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