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2 years ago

So I was doing a hooda math escape game, and forgot how to do these. Can you help me?

Mathematics

2 answers:

Alika [10]2 years ago

5 0

to find the radius you divide the circumference by 2pi

area is pi times radius to the 2nd power

Maslowich2 years ago

5 0

Answer:

The formula for area equals pi times the radius squared, R stands for the radius measurement of the circle. So the formula is area equals pi R squared.

Step-by-step explanation:

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Correct answers only please!

irina1246 [14]

Answer:

C. 67 mph

Step-by-step explanation:

The speedometer reports speed based on the number of revolutions the tire makes in a given time period. If the motorcycle travels 28/25 times as far on each revolution, its speed is 28/25 times as great.

(28/25)(60 mph) = 67.2 mph ≈ 67 mph

_____

The distance traveled is proportional to the circumference of the tire, which is proportional to the diameter. Hence, actual speed for a given speedometer reading is proportional to the diameter of the tire.

8 0

2 years ago

Read 2 more answers

tamara Travels by plane to visit her sister in California once a month if tomorrow travels a total distance of 2753 miles each t

vfiekz [6]

Tamara travels 33,036 miles in a year
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hope this helps!

3 0

2 years ago

A car is being driven at a rate of 40 ft/sec when the brakes are applied. The car decelerates at a constant rate of 10 ft/sec2.

IRISSAK [1]

Answer:

80 feet

Step-by-step explanation:

Given:

Initial speed of the car ( $v_0$ ) = 40 ft/sec

Deceleration of the car ( $\frac{dv}{dt}$ ) = -10 ft/sec²

Final speed of the car ( $v_x$ ) = 0 ft/sec

Let the distance traveled by the car be 'x' at any time 't'. Let 'v' be the velocity at any time 't'.

Now, deceleration means rate of decrease of velocity.

So, $\frac{dv}{dt}=-10\ ft/sec^2$

Negative sign means the velocity is decreasing with time.

Now, $\frac{dv}{dt}=\frac{dv}{dx}(\frac{dx}{dt})$ using chain rule of differentiation. Therefore,

$\frac{dv}{dx}\cdot\frac{dx}{dt}= -10\\\\But\ \frac{dx}{dt}=v.\ So,\\\\v\frac{dv}{dx}=-10\\\\vdv=-10dx$

Integrating both sides under the limit 40 to 0 for 'v' and 0 to 'x' for 'x'. This gives,

$\int\limits^0_{40} {v} \, dv=\int\limits^x_0 {-10} \, dx\\\\\left [ \frac{v^2}{2} \right ]_{40}^{0}=-10x\\\\-10x=\frac{0}{2}-\frac{1600}{2}\\\\10x=800\\\\x=\frac{800}{10}=80\ ft$

Therefore, the car travels a distance of 80 feet before stopping.

4 0

2 years ago

Hello, could someone help me with this one?

ipn [44]

Answer:

The answer is A

Step-by-step explanation:

3 0

2 years ago

If a car is traveling at 60 mph and the driver suddenly hits the brakes, what would be the distance before the driver reaches a

abruzzese [7]

Answer:

60 feet?

Step-by-step explanation:

6 0

2 years ago