All categories

4 years ago

Can you cube root a negative number? Why or why not?

Mathematics

1 answer:

nasty-shy [4]4 years ago

8 0

Answer: no

Step-by-step explanation:

Negative numbers can't have real number square roots, but negative numbers can have real number cube roots

You might be interested in

Solve y=-2x+6 and 3y-x+3=0 using substitution

Mazyrski [523]

3(-2x+6) -x+3=0
-6x+18-x+3=0
-7x+21=0
-7x=-21
x=3

y=-2x+6
y=-2(3)+6
=6-6
=0

answer: (3,0)

7 0

3 years ago

Sarah is doing research on the average age of first-year resident physicians. She wants her estimate to be accurate to within 1

WINSTONCH [101]

Answer: The number of first-year residents she must survey to be 95% confident= 263

Step-by-step explanation:

When population standard deviation ( $\sigma$ ) is known and margin of error(E) is given, then the minimum sample size (n) is given by :-

$n=(\dfrac{z^*\sigma}{E})^2$ , z* = Two-tailed critical value for the given confidence interval.

For 95% confidence level , z* = 1.96

As, $\sigma$ = 8.265, E = 1

So, $n= (\dfrac{1.96\times8.265}{1})^2 =(16.1994)^2\\\\= 262.42056036\approx263\ \ \ [\text{Rounded to the next integer}]$

Hence, the number of first-year residents she must survey to be 95% confident= 263

7 0

3 years ago

For the past three months Grace used her cell phone for 43 minutes 62 minutes and 57 minutes how many minutes would you have to

RSB [31]

Answer:

Grace should use her phone for 58 minutes to maintain an average of 55 minutes.

Step-by-step explanation:

Usage of first month = 43 minutes

Second month = 62 minutes

Third Minutes = 57 minutes

Let, the usage of fourth month = k minutes

Mean of the data = 5 minutes

Now, Average of a Data = $\frac{\textrm{Sumof observations}}{\textrm{Total number of observations}}$

⇒ $55 = \frac{43 + 62 + 57 + k}{4}$

or, 55 x 4 = 162 + k

⇒ 220 - 162 = k

or, k = 58 minutes

So, Grace should use her phone for 58 minutes to maintain an average of 55 minutes.

5 0

3 years ago

Nevaeh had 12 blue pencils and 18 red pencils to give out equally among the maximum number of classmates. How many red pencils w

marissa [1.9K]

Answer:

The answer to this problem is 3

Step-by-step explanation:

8 0

4 years ago

Complete the statements about the key components of the hyperbola shown. The distance, a, between the center and each vertex is

Aloiza [94]

Answer:

A.4 B.5 C.3 D.4/3

Step-by-step explanation:

i just did it

3 0

4 years ago