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3 years ago

What is the measure of AB in O below?

Mathematics

1 answer:

8_murik_8 [283]3 years ago

8 0

Answer:

The measure of an arc is equal to the angle opposite it

Therefore the answer is C. 100°

Hope this helps!

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A speed walker covered 4 1/2 mi in 3/4 hour. How far will he walk in 3/4 hour if he walks?

Nezavi [6.7K]

Given:

Consider the complete question is "A speed walker covered $4\dfrac{1}{4}$ mi in $\dfrac{3}{4}$ hour. How far will he walk in 3/4 hours if he walks twice as fast?"

A speed walker covered $4\dfrac{1}{4}$ mi in $\dfrac{3}{4}$ hour.

To find:

Distance covered by him if in 3/4 hour if he walks twice as fast.

Solution:

We have,

$Distance=4\dfrac{1}{2}=\dfrac{9}{2}$

It means a speed walker covered $\dfrac{9}{2}$ mi in $\dfrac{3}{4}$ hour.

If the speed is twice then he can cover double distance is same time.

Distance covered by him if in 3/4 hour if he walks twice as fast is

$2\times \dfrac{9}{2}=9$

Therefore, distance covered by him is 9 mi.

7 0

3 years ago

Solve for x..................

Yanka [14]

Answer:

x = 4

Step-by-step explanation:

(5x+131)° and (5x+19)° are supplementary. Therefore, (5x+19)° + (5x+131)° equals to 180°.

Knowing that, we can do the following:

(5x+19) + (5x+131) = 180
5x + 19 + 5x + 131 = 180
10x + 140 = 180
10x = 40
<em>x = 4</em>

4 0

3 years ago

Which number is greater 65% or 0.56

coldgirl [10]

65% is bigger than 0.56 which would be 56%

8 0

3 years ago

Read 2 more answers

The measurenicnt of the circumference of a circle is found to be 56 centimeters. The possible error in measuring the circumferen

BartSMP [9]

Answer:

(a) Approximate the percent error in computing the area of the circle: 4.5%

(b) Estimate the maximum allowable percent error in measuring the circumference if the error in computing the area cannot exceed 3%: 0.6 cm

Step-by-step explanation:

(a)

First we need to calculate the radius from the circumference:

$c=2\pi r\\r=\frac{c}{2\pi } \\c=8.9 cm$

I leave only one decimal as we need to keep significative figures

Now we proceed to calculate the error for the radius:

$\Delta r=\frac{dt}{dc} \Delta c\\\\\frac{dt}{dc} = \frac{1}{2 \pi } \\\\\Delta r=\frac{1}{2 \pi } (1.2)\\\\\Delta r= 0.2 cm$

$r = 8.9 \pm 0.2 cm$

Again only one decimal because the significative figures

Now that we have the radius, we can calculate the area and the error:

$A=\pi r^{2}\\A=249 cm^{2}$

Then we calculate the error:

$\Delta A= (\frac{dA}{dr} ) \Delta r\\\\\Delta A= 2\pi r \Delta r\\\\\Delta A= 11.2 cm^{2}$

$A=249 \pm 11.2 cm^{2}$

Now we proceed to calculate the percent error:

$\%e =\frac{\Delta A}{A} *100\\\\\%e =\frac{11.2}{249} *100\\\\\%e =4.5\%$

(b)

With the previous values and equations, now we set our error in 3%, so we just go back changing the values:

$\%e =\frac{\Delta A}{A} *100\\\\3\%=\frac{\Delta A}{249} *100\\\\\Delta A =7.5 cm^{2}$

Now we calculate the error for the radius:

$\Delta r= \frac{\Delta A}{2 \pi r}\\\\\Delta r= \frac{7.5}{2 \pi 8.9}\\\\\Delta r= 0.1 cm$

Now we proceed with the error for the circumference:

$\Delta c= \frac{\Delta r}{\frac{1}{2\pi }} = 2\pi \Delta r\\\\\Delta c= 2\pi 0.1\\\\\Delta c= 0.6 cm$

5 0

4 years ago

Is negative twelve a whole number,integer,or rational number?

mrs_skeptik [129]

Its an Integer. Integers include negative numbers, zero and positive numbers :)

8 0

3 years ago

Read 2 more answers