Which is an equation of a circle with center (2, -10) and radius 3?

Mathematics

1 answer:

Ilya [14]3 years ago

6 0

C.(x-2)^2+(y+10)^2=9, plug the numbers in the original formula.

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Help i’m failing school rn lol

puteri [66]

Answer:

B.9x

Step-by-step explanation:

A term is a single mathematical expression. It may be a single number (positive or negative), a single variable ( a letter ), several variables multiplied but never added or subtracted. Some terms contain variables with a number in front of them. The number in front of a term is called a coefficient.

6 0

2 years ago

Factor each expression<br> 1. 3n + 9<br> 2. t² + 4t<br> 3. 15 + 20x

Gnom [1K]

1... 3 (n + 3)
2... t (t + 4)
3... 5 (3 + 4x)

The trick to all of these is finding common factors, then taking them out... IT's pretty easy once you get the hang of it.

4 0

3 years ago

Consider a sample with data values of 10, 20, 12, 17, and 16. Compute the z-score for each of the five observations. If required

Mila [183]

Answer:

$\begin{tabular}{c|ccccc}{$x$&10&12&16&17&20&z&-1.397&-0.839&0.2795&0.559&1.397&\end{tabular}$

Step-by-step explanation:

z-score is denoted by:

$z=\dfrac{x-\mu}{\sigma}$

here,

$\mu$ : mean

$\sigma$ : standard deviation (or the square root of the variance)

so first we need to find the means of our sample:

$\mu=\dfrac{10+20+12+17+16}{5}\\\mu = 15\\$

Now to find the standard deviation we first need to find the variance of the sample. The variance is the sum of the squares of the differences of each value from the mean.

$\sigma^2 = \dfrac{(10-15)^2+(20-15)^2+(12-15)^2+(17-15)^2+(16-15)^2}{5}\\\sigma^2 = 12.8$