All categories

3 years ago

Please!! I have to do this by tonight!!

Mathematics

1 answer:

Aneli [31]3 years ago

4 0

Answer:

Prob.3

Denote r: radius of circle O

Formula for calculating AOB sector:

Area = pi*r^2*angle/360

Area = pi*r^2*45/360 = 18 pi

=> r^2 = 18*360/45 = 144

=> r = 12

For prob.4, give it a try, follow the formula I gave. Good luck !

(answer : r = 6)

You might be interested in

Solve for x.<br><br> 2x+3y=20<br> -2x+y=4

Mama L [17]

Answer:

x = 1

Step-by-step explanation:

-2x + y = 4

y = 2x + 4

2x + 3y = 20

2x + 3(2x + 4) = 20

2x + 6x + 12 = 20

8x + 12 = 20

8x = 8

x = 1

3 0

2 years ago

Need help with this

Alecsey [184]

$\frac{x {}^{3} - 3x {}^{2} - 10x {}^{2} + 30x + 4x - 12 }{x - 3 } \\ \frac{x {}^{2} \times (x - 3) - 10x \times (x - 3) + 4 \times (x - 3) }{x - 3} \\ \frac{(x - 3)(x {}^{2} - 10x + 4 )}{x - 3} \\ x {}^{2} - 10x + 4$

8 0

3 years ago

Solve the equation: 3(x - 4) = -21 *

romanna [79]

Answer:

x = -3

Step-by-step explanation:

simplify

3(x - 4) = -21

3x - 12 = -21

3x = = -9

x = -3

7 0

3 years ago

Read 2 more answers

The temperature T in degrees Celsius of a liquid t minutes after heating is given by the formula T=8√t. When is the temperature

Advocard [28]

T=8√t
T=temperature
t=time in minutes.
If T=48, we have to calculate the time.

48=8√t
(48)²=(8√t)²
2304=64t
t=2304 / 64=36

answer: 48 degrees Celsius will be reached in 36 minutes.

3 0

3 years ago

6. a) Rivka used the last four digits of her

bulgar [2K]

Answer: Her e-mail password is $1048222131$