Determine the approximate circumference of a circle with diameter 18 units.

Mathematics

1 answer:

Sphinxa [80]2 years ago

8 0

Answer: 56.549 or 56.5

Explanation:

C= (pie) 3.14 * d = 2 * 3.14 * r

D= 18

C = 3.14 * 18 = 18 * 3.14

C = 56.549 or 56.5

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A turntable rotates counterclockwise at 78 rpm. A speck of dust on the turntable is at an initial angular position of 0.45 radia

SashulF [63]

Answer:

Displacement will be 11 revolution and 1.02π radian

Step-by-step explanation:

We have given that initial angular position = 0.45 radian

Angular speed $\omega =78rpm=\frac{2\times \pi\times 78}{60}=8.164rad/sec$

Time is given as t = 8.8 sec

So angular displacement in 8.8 sec

$\Theta =8.8\times \times 8.164=71.8432radian$

As he has already covered 0.45 radian

So total angular displacement = 0.45 + 71.8432 = 72.2932 radian

We know that 1 revolution = 2π = 2×3.14 = 6.28 radian

So 11 revolution = 11×6.28 = 69.08 radian

Left dispalcement = 72.2932 - 69.08 = 3.2132 radian = 1.02π radian

3 0

2 years ago

-3x(4+(-7)) in distributive property

Liula [17]

Answer: 9

explanation:
4+(-7)= -3
next, you multiply -3 and -3 which is 9 as the two negatives cancel out

8 0

2 years ago

Is anyone good at elimination method? I will give 10 points to the person that answer the question. :)

Licemer1 [7]

To eliminate x, the coefficients of x's in both equations should be opposite numbers. Since the coefficient of x in the second equation is 3, the coefficient in the first equation should be -3. So she should multiply the first equation by -3.

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3 years ago

Read 2 more answers

What is really answer please help

Reika [66]

Answer:

4±√5

EXPLAINED ANSWER:

Since the variable is a binomial and it is squared, we apply square root on both side, and apply the ± sign on the right side (since the solution of a square root can be both positive and negative), and later pass the 4 positive to the other side.

√25 can be (5)(5) or (-5)(-5)