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3 years ago

Plz help me by answering these circled questionsin steps plz

Mathematics

1 answer:

igor_vitrenko [27]3 years ago

3 0

a- is -28 and i’m working out the rest for you now

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Solve for (x, y) elimination method. show your work 2x + y = 5 x - y = 1

mr Goodwill [35]

Answer:

x=2

y=1

(i guess)

hope it helps

3 0

2 years ago

Suppose that you are an elementary school teacher and you are evaluating the reading levels of your students. You find an indivi

aleksklad [387]

Answer:

The child's reading level is at the 3.4th percentile.

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.

You do some research and determine that the reading rates for their grade level are normally distributed with a mean of 90 words per minute and a standard deviation of 24 words per minute.

This means that $\mu = 90, \sigma = 24$

You find an individual that reads 46.4 word per minute. At what percentile is the child's reading level?

The percentile is the p-value of Z when X = 46.4, multiplied by 100. So

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

$Z = \frac{46.4 - 90}{24}$

$Z = -1.82$

$Z = -1.82$ has a p-value of 0.034.

0.034*100 = 3.4

The child's reading level is at the 3.4th percentile.

6 0

2 years ago

A right triangle has (non-hypotenuse) sides of length 3 meters and 6 meters. what is the hypotenuse of the triangle and what is

kirill115 [55]

The hypotenuse is sqrt(45) or 6.708

The angle is 63.43 degrees

4 0

3 years ago

Select all possible numbers that when replaced with the "?" in the set of ordered pairs {(3, 4), (–2, –5), (?, 0)} would create

Irina18 [472]

The answers to this are:
A. –5
C. 0
E.7

6 0

3 years ago

The the surface area of a cylinder with radius R and height H is twice the product of Pi and the square of the radius plus twice

Y_Kistochka [10]

Concept:

(1) Curved surface area of cylinder = Circumference of the base × Height of cylinder

(2) Area of the base = Area of circle = π × (radius)²

(3) Circumference of the base = 2×π× (radius)

Consider a right circular cylinder as given in attached figure

Its height (AB) = H

Its radius (OC) = R

Now, we shall calculate the curved surface area of the cylinder (CSA)

(CSA) = Circumference of the base × Height of cylinder

(CSA) = 2×π×R × H = 2πRH -------(i)

Again, we shall calculate the area of the top and bottom circles

Area of the top and bottom (A) = 2× Area of circle

(A) =2×[ π × (radius)²]

or, (A) = 2×π×R² = 2πR²------------(ii)

Now, we shall calculate the surface area or total surface area of the cylinder.

SA = CSA + A

SA = 2πRH + 2πR²

or, SA = 2πR² + 2πRH

This is the required equation.

4 0

3 years ago