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2 years ago

Question:

Mathematics

1 answer:

Y_Kistochka [10]2 years ago

6 0

The frame can hold a mirror with an area of 78.5 in².

The area for a circle of diameter D is given by the formula:

$A = pi*(D/2)^2$

Where pi = 3.14

Here we know that the diameter is 10 inches, replacing that in the area equation we can get:

$A = 3.14*(10in/2)^2 = 3.14(5in)^2 = 78.5 in^2$

So the frame can hold a mirror with an area of 78.5 in².

If you want to learn more about circles:

brainly.com/question/1559324

#SPJ1

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there are 18 lions, tigers and bears. If the number of lions is 4 less than 3 times the number of bears and the number of tigers

Harlamova29_29 [7]

$bears = x \\ lions = 3x - 4 \\ tigers = \frac{ 3}{4}x + 3$

all you have to do next is add all of them in one equation and equate them to 18

when you find x, replace in each expression to get your answers

8 0

3 years ago

Naomi and Claire are painting a mural. Naomi paints 2 square feet per hour and has already painted 16.5 square feet.

mrs_skeptik [129]

Answer:

4.5 hours

Step-by-step explanation:

let t be the time elapsed

Therefore, we can set up a system of equations and solve accordingly

2t + 16.5 = 4t + 7.5

2t = 9

t = 4.5 hours more till they paint the same amount in square feet

3 0

3 years ago

Sam walks at a rate of 300 ft per minute. How many inches per second does he walk? (1 foot = 12 inches)

bazaltina [42]

300/min
300/60 seconds
300 divided by 60=5
5 ft/second
5ft=60 inches
60 inches/second

Final Answer: B

6 0

3 years ago

A conductor possesses a positive charge of 3.2x 10-19 C. How many electron does it have in excess or deficit (e = 1.60 x 10-19C)

LenKa [72]

The no of electrons it have in deficit=1.60

Given:

Charge possessed by a conductor = $3.2 \times 10^{-19} C$

Charge of an electron= $1.6 \times 10^{-19} C$

To find:

Amount of electrons in excess or deficit

<u>Step by Step Explanation:</u>

Solution;

Formula used for calculating electrons in excess or deficit is given as

Electrons in excess or deficit= Normal electron charge- Charge of the conductor

Also we know Charge of Conductor $=3.2 \times 10^{-19} C$ and Electron charge $=1.6 \times 10^{-19} C$

Substitute these values in the above equation we get

Electrons in excess or deficit= $1.60 \times 10^{-19} \mathrm{C}-3.2 \times 10^{-19} \mathrm{C}$

= -1.60

Result:

Hence, it has a deficit of 1.60 electrons.

3 0

4 years ago

The sum of Ellie's age and Genya's age is 60. In sex years, Genya will be eight times older than Ellie will be. How old is Ellie

Darina [25.2K]

Answer:

ellie is 2 and genya is 58, explanation in picture attached

4 0

3 years ago