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3 years ago

Find the circumference and the area of a circle with diameter 7 cm

Mathematics

1 answer:

zepelin [54]3 years ago

3 0

Circumference formula: diamter*pi=7pi
Area = pi*r^2=pi(3.5)^2=12.25pi.

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Pls help me this is do in 10 minutes

aalyn [17]

Each ticket costs $7 and on Friday every ticket is discounted by $2 so the cost of every ticket would be $5 on Friday and 5x9=45 so the cost for 9 tickets on Friday is worth $45

3 0

3 years ago

You asked 50 randomly chosen employees of a company how many books they read each month. the diagram show the results. there 600

podryga [215]

Answer:

About 432 people read at least one book per month.

Step-by-step explanation:

36/50 people read at least one book, multiply 36/50 by 12 to make the fraction 432/600.

8 0

3 years ago

Given points A(-1, -2) and B(2, 4) where AP: BP=1:2, find the locus of point P.

koban [17]

Answer:

$x^2 + 4x + y^2 +8y = 0$

Step-by-step explanation:

Given

$A = (-1,-2)$

$B = (2,4)$

$AP:BP = 1 : 2$

Required

The locus of P

$AP:BP = 1 : 2$

Express as fraction

$\frac{AP}{BP} = \frac{1}{2}$

Cross multiply

$2AP = BP$

Calculate AP and BP using the following distance formula:

$d = \sqrt{(x - x_1)^2 + (y - y_1)^2}$

So, we have:

$2 * \sqrt{(x - -1)^2 + (y - -2)^2} = \sqrt{(x - 2)^2 + (y - 4)^2}$

$2 * \sqrt{(x +1)^2 + (y +2)^2} = \sqrt{(x - 2)^2 + (y - 4)^2}$

Take square of both sides

$4 * [(x +1)^2 + (y +2)^2] = (x - 2)^2 + (y - 4)^2$

Evaluate all squares

$4 * [x^2 + 2x + 1 + y^2 +4y + 4] = x^2 - 4x + 4 + y^2 - 8y + 16$

Collect and evaluate like terms

$4 * [x^2 + 2x + y^2 +4y + 5] = x^2 - 4x + y^2 - 8y + 20$

Open brackets

$4x^2 + 8x + 4y^2 +16y + 20 = x^2 - 4x + y^2 - 8y + 20$

Collect like terms

$4x^2 - x^2 + 8x + 4x + 4y^2 -y^2 +16y + 8y + 20 - 20 = 0$

$3x^2 + 12x + 3y^2 +24y = 0$

Divide through by 3

$x^2 + 4x + y^2 +8y = 0$

3 0

3 years ago

What values of y satisfy this equation?<br><br> 3y - 14 = 16

TiliK225 [7]

Answer:

By making y alone

Step-by-step explanation:

3y-14=16

+14 +14

3y= 30

divide 3 on both sides

y=10

Hope this helps!

6 0

3 years ago

A jar contains 11 brown and 18 blue marbles. A marble is drawn at random. What is the probability that the marble is not blue?

fgiga [73]

Answer:

Step-by-step explanation:

7 0

3 years ago