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3 years ago

Form an equivalent expression 5x + 9z -x

1 answer:

3 0

5x+9z-x
5x-x+9z
4x+9z

Equivalent expression is asking for you to simplify by adding like terms and eliminatino parenthesis. Use the PEMDAS.

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Rainwater was collected in water collectors at thirty different sites near an industrial basin and the amount of acidity (pH lev

stiv31 [10]

Answer:

The mean and standard deviation of the corrected pH measurements are 6.63 and 3.8025 respectively.

Step-by-step explanation:

We can correct the values of the mean and standard deviation using the properties of the mean and the variance.

To the original value X we have to add 0.2 and multiply then by 1.3 to calculate the new and corrected value Y:

$Y=1.3(X+0.2)$

The mean and standard deviation of the original value X are 4.9 and 1.5 respectively.

Then, we can apply the properties of the mean as:

$E(Y)=E(1.3(X+0.2))=1.3E(X+0.2)=1.3E(X)+1.3*0.2\\\\E(Y)=1.3E(X)+0.26\\\\E(Y)=1.3*4.9+0.26=6.37+0.26=6.63$

For the standard deviation, we apply the properties of variance:

$V(Y)=V(1.3(X+0.2))\\\\V(Y)=1.3^2\cdot V(X+0.2)\\\\V(Y)=1.69\cdot V(X)\\\\V(Y)=1.69\cdot 1.5^2=1.69\cdot 2.25=3.8025$

The properties that have been applied are:

$1.\,E(aX)=aE(X)\\\\ 2.\,E(X+b)=E(X)+b\\\\3.\,V(aX)=a^2V(X)\\\\4.\,V(X+b)=V(X)+0$

3 0

3 years ago

Select the line segment Please helppppp !!!!

Anon25 [30]

Answer:

Step-by-step explanation:

A line is straight, and a segment is a part of a line.

A and D and lines because they have the arrows on the side, meaning they keep going and are not a segment.

B is not a line, it curves.

So that leaves C to be the answer because it is the only straight one with no arrows.

5 0

3 years ago

Convert 3/8 to a decimal and percent but pls explain how you guys get 375 pls ;-;

natali 33 [55]

You just divide 3 by 8. when 3 is inside the "house" and 8 is outside, 8 doesn't go into 3 so move on and 8 goes into 30 3 times. and so forth. 30-24=6 bring down the 0. 8 goes into 60 7 times. the decimal is 0.375. the percent is 37.5%.

7 0

3 years ago

A function is described by the equation f(x) = 2x + 3. The replacement set for the independent variable is (2,4,6,8). Which set

Anna11 [10]

<h3>Answer: {7, 11, 15, 19}</h3>

Write the values in the order shown. The curly braces indicate a set.

=================================================

Explanation:

The replacement set for the independent variable is {2,4,6,8}

This means we'll plug x = 2, x = 4, x = 6, and x = 8 into the function one at a time to find the corresponding y = f(x) value.

---------

Plug in x = 2 to find that,

f(x) = 2x+3

f(2) = 2*2+3 ... replace every x with 2

f(2) = 4+3

f(2) = 7

If the input is x = 2, then the output is y = 7. Therefore, the '2' in the domain corresponds to '7' in the range.

If you repeat those steps for x = 4, then you should find that f(4) = 11. Do the same thing for x = 6 and it should lead to y = 15. The last value in the range is y = 19 which corresponds to x = 8.

In short, the domain {2,4,6,8} corresponds to the range {7, 11, 15, 19}

Usually with sets, order doesn't matter. However, in this case, the order is important because we need to match the 2 with the 7, the 4 with the 11, etc.

6 0

3 years ago

Suppose you toss a coin four times. What is the probability that you get heads on the second, third, and fourth losses?

Svetach [21]

Answer:

3:4

Step-by-step explanation:

probability = what wanted : total outcome

= 3 heads : 4 tosses

= 3 : 4

4 0

3 years ago