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3 years ago

Please help I need this done today

Mathematics

1 answer:

PSYCHO15rus [73]3 years ago

4 0

Answer:

The formula for the area is πr² where r is the radius.

But the radius wasn't given so we have to ring it via the circumference given.

Step-by-step explanation:

Circumference = 87.92

To find the radius;

The formula for finding the circumference is 2πr. Therefore;

$87.92 = 2\pi r \\ \pi = 3.14 \\ therefore \\ 87.92 = 2 \times 3.14r \\87.92 = 6.28r \\ we \: have \: to \: make \: r \: the \: subject \\ r = \frac{87.92}{6.28} \\ = 14$

So now that we have our radius to be 14 we substitute it into the equation for finding the area

$area = \pi {r}^{2} \\ r = 14 \\ therefore \\ area = 3.14 \times {14}^{2} \\ = 3.14 \times 196 \\ = 615.44 \: square \: inches$

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Veena's father is 7 years older than five times the age of Veena. If his age is 37. find Veena's age.

ra1l [238]

Step-by-step explanation:

let Veena father be x and Veena be y

x=5y+7

x=37

37=5y+7

30=5y

y=6

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4 years ago

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gulaghasi [49]

Answer:

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3 years ago

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vichka [17]

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4 years ago

Factoring by grouping x^2 + 4y + 2x + 2xy pls explain with work too!!!

Gennadij [26K]

${x}^{2} + 4y + 2x + 2xy$

We can factorise this expression by grouping. First let us arrange it in this way

$= {x}^{2} + 2xy + 2x + 4y$

Let us bracket them like this:

$= ( {x}^{2} + 2xy) + (2x+ 4y)$

In the first bracket portion, take x as common and in the second expression, take 2 as common.

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Answer:

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3 years ago

Read 2 more answers

Allen wants to have a mean of 90 on his math quizzes. So far, he has scored 86, 94, 88, 95, and 89. What is the least score that

viva [34]

Answer:

Step-by-step explanation:

$\frac{86 + 94 + 88 + 95 + 89 + x}{6} = 90$

The mean would be the sum of all the math quiz grades divided by the number of quizzes taken.

Solve for x:

$86 + 94 + 88 + 95 + 89 + x = 540$

$452 + x = 540$

$x = 88$

Thus, Allen needs at least an 88 to obtain a mean of at least 90.

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3 years ago