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2 years ago

Find the area of this circle. Use 3 for T. A = 7r2 4 in [?] in2 Enter Help!!!!!

Mathematics

1 answer:

Allushta [10]2 years ago

6 0

Sorry I don’t know the answer I’ve been looking for the similar one wish I could help

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Solve the equation.

Gelneren [198K]

Answer:

x=-5/4 or x=9/4

Step-by-step explanation:

2 - 4x = -7

-4x = -7 - 2

-4x = -9

x = 9/4

2 - 4x = 7

-4x = 7-2

-4x = 5

x = -5/4

5 0

1 year ago

in a group of 120 people,90 of them are 30 years old or older. Everyone else in the group is younger than 20 years old. If a per

Ksju [112]

36% chance of the person being less than 20 years okd

3 0

2 years ago

Prove each of these identities.

Stella [2.4K]

Answer:

Identity (a) can be re-written as

$sec x\ cosec x - cot x = tan x$

which we already proven in another question, while for idenity (b)

$(A)\frac 1 {sin x} -sin x = cos x \frac{cos x}{sin x}\\\\(B)\frac {1-sin^2x}{sin x} = \frac {cos^2x} {sin x} \\\\(C) \frac {cos^2x}{sin x} =\frac {cos^2x} {sin x}$

step A is simply expressing each function in terms of sine and cosine.

step B is adding the terms on the LHS while multiplying the one on RHS.

step C is replacing the term on the numerator with the equivalent from the pithagorean identity $cos^2x + sin^2x = 1$

8 0

2 years ago

What 2 digit numbers multiply to 2,025

Lana71 [14]

Square root 2,025 to get 45.
Or, multiply 45 × 45 to get 2,025.

Answer: 45

6 0

2 years ago

If a car has tires with a diameter of 28 inches and is traveling at 55 mph, how fast are its tires spinning, in rpm^ prime s (re

Aleksandr-060686 [28]

Answer:

The tires are spinning at 660.49 revolutions per minute.

Step-by-step explanation:

The speed of the tires (v) is the same that the speed of the car, so to find the angular velocity of the tires we need to use the equation:

$\omega = \frac{v}{r}$

Where:

r: is the radius of the tires = d/2 = 28 inches/2 = 14 inches

$\omega = \frac{55 mph}{14 inches*\frac{1 mile}{63360 inches}} = 2.49 \cdot 10^{5} \frac{rad}{h}*\frac{1 h}{60 min}*\frac{1 rev}{2\pi rad} = 660.49 rpm$

Therefore, the tires are spinning at 660.49 revolutions per minute.

I hope it helps you!

5 0

2 years ago