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3 years ago

Please I really need help

Mathematics

1 answer:

trapecia [35]3 years ago

5 0

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What type of number is √25? Whole number , integer , rational or irrational . SELECT ALL THAT APPLY

Arlecino [84]

Answer:

A, B, and C.

Step-by-step explanation:

The square root of 25 is 5. 5 is rational, a whole number, and an integer.

8 0

2 years ago

33. Suppose that the scores on a statewide standardized test are normally distributed with a mean of 78 and a standard deviation

tino4ka555 [31]

Given the scores on a statewide standardized test are normally distributed

Mean = μ = 78

Standard deviation = σ = 3

Normalize the data using the z-score by using the following formula and chart:

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

Estimate the percentage of scores of the following cases:

(a) between 75 and 81

so, the z-score for the given numbers will be:

$\begin{gathered} 75\rightarrow z=\frac{75-78}{3}=\frac{-3}{3}=-1 \\ 81\rightarrow z=\frac{81-78}{3}=\frac{3}{3}=1 \end{gathered}$

As shown, the percentage when (-1 < z < 1) = 68%

(b) above 87

$87\rightarrow z=\frac{87-78}{3}=\frac{9}{3}=3$

The percentage when (z > 3) = 0.5%

(c) below 72

$72\rightarrow z=\frac{72-78}{3}=\frac{-6}{3}=-2$

The percentage when (z < -2) = 0.5 + 2 = 2.5%

(d) between 75 and 84

$\begin{gathered} 75\rightarrow z=\frac{75-78}{3}=-\frac{3}{3}=-1 \\ 84\rightarrow z=\frac{84-78}{3}=\frac{6}{3}=2 \end{gathered}$

The percentage when ( -1 < z < 2 ) = 68 + 13.5 = 81.5%

3 0

1 year ago

In a card game, Alex has 2 diamonds 3 spades 4 clubs, and 1 heart. Without being able to see the cards wes is going to pick one

Helga [31]

Answer:

4/10 or 40% chance he picks a spade and 3/10 or 30% he picks a club so in total he would have a 7/10 chance or 70% chance of getting spade or club

Step-by-step explanation:

3 0

2 years ago

Question as attached screenshot

olga nikolaevna [1]

Answer:

m= -2 c= -1

Step-by-step explanation:

2x+3y+1=0

3y= -2x-1

3 0

3 years ago

Connie has to solve the following problem.

Sever21 [200]

Answer:

$\$45$

Step-by-step explanation:

we know that

5 boxes of cereal costs $12.50

Using proportion

Find how much will 18 boxes cost

Let

x -----> the cost of 18 boxes

$\frac{12.5}{5}\frac{\$}{boxes}=\frac{x}{18}\frac{\$}{boxes}\\ \\x=12.5*18/5\\ \\x=\$45$

8 0

3 years ago