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4 years ago

If the circumference of a circle is doubled, would the area be as well?

Mathematics

2 answers:

tatuchka [14]4 years ago

8 0

NO.

Circumference=2 $\pi$ r.

If the circumference is doubled radius has to be doubled.

But for Area, A= $\pi$ $r^{2}$ . doubling radius means area will be quadrupled.

please mark as brainiest.......

Morgarella [4.7K]4 years ago

7 0

No the circumference does not effect the area if it is doubled figure out the circumference then plug into the formula given to you to find the area of the circumference also try doing ur own work ;)

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Solve for the value of x in this equation: 10+7x=-60

Reika [66]

Answer:

x = -10

Step-by-step explanation:

10 + 7x = - 60

- 10 = - 10

7x = -70

x = -10

3 0

3 years ago

Read 2 more answers

Find the number of 4-digit numbers that contain at least three odd digits.

Greeley [361]

Answer:

3000

Step-by-step explanation:

First find the 4 digit numbers that have all odd digits

Possible Odd digits =5(1,3,5,7,9)

So, total number of 4 digit numbers with odd digits can be calculated as =5×5×5×5=625

Now find all the 4 digits numbers with at least 3 odd digits and the first digit as either 2,4,6,8 ( 0 would make it a 3 digit number)

The first digit can be 2,4,6,8

=4×5×5×5=500

Now find all the 4 digits numbers with at least 3 odd digits and the second digit as either 0,2,4,6,8

=5×5×5×5=625

Now find all the 4 digits numbers with at least 3 odd digits and the third digit as either 0,2,4,6,8

Now find all the 4 digits numbers with at least 3 odd digits and the second digit as either 0,2,4,6,8

=5×5×5×5=625

Now find all the 4 digits numbers with at least 3 odd digits and the fourth digit as either 0,2,4,6,8

=5×5×5×5=625

Add them together

625+500+625+625+625=3000

4 0

4 years ago

Read 2 more answers

Which expression is equivalent to 8? -48 ÷ 6 48 ÷ (-6) 48 ÷ 6 -48 ÷ (-6)

V125BC [204]

Expression 3,
because 6 and 8 are factors of 48. Since positive 6 & 8 are the two numbers of choice, the product will be positive. My answer is reasonable because if you were to multiply positive 8 and 6 you will get positive 48.

8 0

3 years ago

The time needed to complete a final examination in a particular college course is normally distributed with a mean of minutes an

Andrej [43]

Answer:

a. This probability is the p-value of Z when X = 60.

b. This probability is the p-value of Z when X = B subtracted by the p-value of Z when X = A.

c. The proportion is the p-value of Z when X is the length of the examination period. How many students is this proportion multiplied by the number of students.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

In this question:

Mean $\mu$ , standard deviation $\sigma$ .

a. What is the probability of completing the exam in one hour or less (to 4 decimals)?

This probability is the p-value of Z when X = 60.

b. What is the probability that a student will complete the exam in more than minutes A but less than B minutes (to 4 decimals)?

This probability is the p-value of Z when X = B subtracted by the p-value of Z when X = A.

c. Assume that the class has students and that the examination period is minutes in length. How many students do you expect will be unable to complete the exam in the allotted time (to nearest whole number)?

The proportion is the p-value of Z when X is the length of the examination period. How many students is this proportion multiplied by the number of students.

3 0

3 years ago

Rachel is 10 years older than her sister, Renee. In six years from now, the sum of their ages will be 40. How old is each girl?

Arisa [49]

Answer: I say the answer is 20 years old, 30 years old

Step-by-step explanation: If rachel is 10 years old than her sister in six years from now, the sum of their ages will be 40. So rachel is 10 years older than her sister so the younger sister has to be 20 years old and and rachel is 30 years old.

4 0

2 years ago