3 years ago

WILL GIVE BRANLIEST TO BEST ANSWER. 25 POINTS!

Mathematics

1 answer:

Likurg_2 [28]3 years ago

4 0

Answer:

if the x is supposed to be squared, the coordinates are (3,2)

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Perform the indicated row operations:<br> -10r2 r2 3r3 <br> [2 -1 -4|7] [0 3 -2|5] [0 10 8|2]

n200080 [17]

Answer:

Second one is -30, 20, -50

Third one is 30, 24, 6

Step-by-step explanation:

6 0

3 years ago

Which expression is equivalent to 2 (14x-3y+28x+12.2-5y-17.5)?

scoundrel [369]

To find the equivalence you need to simplify the expression to get

84x - 16y - 10.6

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3 years ago

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A pencil cost $1.20 and a pen cost $2.90. Jasmiah bought an equal number of such pencils and pens. She spent $32.30 more on the

garri49 [273]

Answer:

Step-by-step explanation:

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3 0

2 years ago

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On which number line are -3 and its opposite shown?

netineya [11]

Answer:

it would be 3

Step-by-step explanation:

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7 0

3 years ago

A person recently read that 84% of cat owners are women. How large a sample should the researcher take if she wishes to be 90% c

Lana71 [14]

Answer:

405

Step-by-step explanation:

To find sample size, use the following equation, where n = sample size, za/2 = the critical value, p = probability of success, q = probability of failure, and E = margin of error.

$n=\frac{(z_{\frac{\alpha }{2} })^{2} *p*q }{E^2}$

The values that are given are p = 0.84 and E = 0.03.

You can solve for the critical value which is equal to the z-score of (1 - confidence level)/2. Use the calculator function of invNorm to find the z-score. The value will given with a negative sign, but you can ignore that.

(1 - 0.9) = 0.1/2 = 0.05

invNorm(0.05, 0, 1) = 1.645

You can also solve for q which is 1 - p. For this problem q = 1 - 0.84 = 0.16

Plug the values into the equation and solve for n.

$n =\frac{(1.645)^2*0.84*0.16}{(0.03)^2}\\n= 404.0997333$

Round up to the next number, giving you 405.

6 0

3 years ago