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3 years ago

Rearrange the formula A = \pi r ^ ( 2) for r

1 answer:

3 0

Consider re-writing this formula as "A = pi*r^2." The backslash symbol "\" is unnecessary.

If A = pi*r^2, and we wish to solve for r, then divide both sides by pi:

A/pi = r^2

Taking the square root of both sides, sqrt(A/pi) = r (r must be positive in this situation).

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I need help it for a dcp

Artyom0805 [142]

Answer:

what grade level is this

5 0

2 years ago

How can you find 5% of any number using mental math?

Kryger [21]

Answer:

Step-by-step explanation:

I'm not sure my way is going to be any quicker or better. Let's take an example.

Suppose you start with 456

Put a decimal at the end of the 6. You get 456.

Shift the decimal to the left one place 45.6

Divide by 2

22.8 (done mentally)

Note: dividing by 2 is easier than dividing by 5. Or multiplying by 5 for that matter.

Check the result.

456 * 5/100 =2280 / 100.

Shift a decimal 2 places to the left.

22.80 which agrees with your result.

8 0

3 years ago

Read 2 more answers

- 4 x + 9 = 21 x=___ help

faust18 [17]

X=-3
because
-4x=21-9
-4x= 12 divide both sides
x=-3

4 0

2 years ago

Read 2 more answers

See question in image and show workings Note : 1 nautical mile = 1.86km

ycow [4]

Answer:

AB is on the latitude 30°N.

Find AB:

AB = 2*3.142*6400*cos 30°*(32+35)/360 = 6482.15 km

BC is along longitude 35°W

Find BC:

BC = 2*3.142*6400*(30 + 20)/360 = 5585.77 km

Total distance traveled:

6482.15 + 5585.77 = 12067.92 km

Convert the distance to nautical miles:

12067.92/1.86 = 6488.13 nautical miles

Find the average speed:

6488.13/22 = 294.92 nautical miles / hour

Note. This is unrealistically high speed for a ship, this must be a plane or the time given wrong.

3 0

1 year ago

Please help answer choices are: A. 46° B. 67° C. 115° D. 134°

bekas [8.4K]

Answer:

134°

Step-by-step explanation:

∠BAC = ∠BCA because it is an isosceles triangle

∠XCA = ∠XAC . Congruent angles

∠XAC = 1/2(46) = 23° . because CE bisects ∠ C

∠XCA = 23°

180° - 23° - 23° = 134° . Sum of all angles in a triangle is 180°

If my answer is incorrect, pls correct me!

If you like my answer and explanation, mark me as brainliest!

-Chetan K

8 0

2 years ago