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3 years ago

What is the approximate area of the circle shown below? 7.8cm

Mathematics

1 answer:

n200080 [17]3 years ago

5 0

Answer:47.78

Step-by-step explanation:area=pie times radius square

=pie times 3.9 square

=47.78

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What is the equation of the line that goes through the points (- 2, 1) and (0, 4) ? (Write your answer in standard form .)

tekilochka [14]

Answer:

$3x-2y+8=0$

Step-by-step explanation:

The slope of the line that goes through the points (-2, 1) and (0, 4) is

$\frac{4-1}{0-(-2)} = \frac{3}{2}$

The slope of the line that goes through the points (x, y) and (0, 4) is

$\frac{4-y}{0-x} = \frac{4-y}{-x}$

So $\frac{3}{2}=\frac{4-y}{-x}\\-3x=2(4-y)=8-2y\\3x-2y+8=0$

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2 years ago

9.5 divided by 14.25

expeople1 [14]

Answer:

$\frac{19}{29}$

Step-by-step explanation:

9.5 divided by 14.35 can also be writen as.....

$\frac{9.5}{14.5} = \frac{19}{29}$

8 0

3 years ago

Read 2 more answers

Please help me with this too , it would mean alot

Mariana [72]

Step-by-step explanation:

IF THE TEMPERATURE WAS -5° AT 5:00 am., WHAT WAS THE TEMPERATURE AT 9:00 am?

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2 years ago

Stan made 24 sales in 6 hours . what is the ratio of sales to hours?

Furkat [3]

Let s = sale

Let h = hours

The ratio is s to h, which can be written as a fraction as 24/6.

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4 years ago

Read 2 more answers

The temperature, H, in degrees Celsius, of a cup of coffee placed on the kitchen counter is given by H = f(t), where t is in min

Deffense [45]

Answer:

f'(t) is negative

The unit is degC/min

At 35 minutes after the coffee was put on the counter, its temperature is 68 and will decrease by about 0.75 in the next 30 seconds.

Step-by-step explanation:

From the question we are told we are told that

The equation for the temperature of a cup of coffee place on a counter is

$H= f(t)$

Here t is the time in minutes the coffee was put on the counter

Generally f(t)' is the derivative of f(t) at it represents the change of the temperature of the cup of coffee with respect to time

Generally for the coffee placed on the counter after a couple of minutes the temperature will decrease hence f(t)' is negative

Generally the unit of the temperature is in degrees Celsius while that of time is in minutes

So the change in temperature with time f(35)' will be in degrees Celsius/minutes (i.e degC/min)

From the question we are told that

$|f(35)'| = 1.5$

i.e the rate of change of temperature after 35 minutes is 1.5

and

$|f(35)| = 68$

i.e the temperature of the cup of coffee after 35 minutes is 67 degC

Now after another t= 30 seconds = $\frac{30}{60}= 0.5 \ minutes$ the rate of change of the temperature of the cup of coffee is

$R = |f(35)'| * t$

=> $R = 1.5 * 0.5$

=> $R = 0.75$

At 35 minutes after the coffee was put on the counter, its temperature is 68 and will decrease by about 0.75 in the next 30 seconds.

5 0

3 years ago