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marysya [2.9K]
3 years ago
8

Help mee please i want to pass

Mathematics
2 answers:
erik [133]3 years ago
7 0

Answer:

Before tax are $538.45

Step-by-step explanation:

549.22 / 1.02 = 538.45

Before tax are $538.45

jekas [21]3 years ago
5 0

Answer:$538.45

Step-by-step explanation: let x be the price before tax was added.

x+0.02x=549.22 1.02x=549.22 x=538.45 (rounded)

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Write the expression 2a+b in the form of a fraction with the given denominator. Check if the domain of the expression changed. I
Ymorist [56]

Answer:

See below

Step-by-step explanation:

I will assume the given denominator is 3a as there is nothing attached to the statement.

Lets first look at the domain of 2a+b. As it is a polynomial with unknowns a and b, we know it has its domain in all real numbers for both  a and b as every polynomial does. For verifying it replace a and b by any real number you can think of.

Domain = a, b belonging to R

Now, if we divide 2a+b by 3a we will have:

(2a+b)/3a

As know we don not have a polynomial we cant state that the domain will still be all the real numbers for sure. We need to go further.

We have a fraction and as every fraction the denominator CAN'T be equal to 0, so 3a MUST be different to 0. This means that a MUST be different to 0. So, now our domain changes:

domain' = a, b belonging to R and a different to 0.

6 0
3 years ago
SOLVE THE EQUATION<br> X-5/8=-2
laila [671]

Answer:

x=-11/8

Step-by-step explanation:

x-(5/8)=-2

Give the -2 a common denominator to make it easy

x-(5/8)= -16/8

Add the 5/8 to the -16/8

x= -11/8

5 0
3 years ago
The 20 tallest buildings in the world have an average height of 1,667.25 feet, with a standard deviation of 318.31 feet. The Zif
valentina_108 [34]

Answer:

Marina, Wuhan center, Zifeng Tower , Shangai Tower

Step-by-step explanation:

Using the z-scores of the Shangai tower and the Marina, we can calculate their heights

Mathematically, the z-score or standard score can be calculated as follows

Zscore =  X - μ/σ

where σ and μ represents the standard deviation and the population mean respectively.

For Shaghai Tower ;

1.27 = (X - 1667.25)/318.31

318.31 × 1.27 = X - 1667.25

404.25 = X - 1667.25

X = 1667.25 + 404.25 = 2071.50

The height of the Shaghai Tower is 2071.50 feet

For Marina, we use the same procedure;

-0.84 = (X - 1667.25)/318.31

318.31 × -0.84 = X - 1667.25

-267.38 = X - 1667.25

X = 1667.25 - 267.38 = 1399.87

The height of Marina building is 1399.87

Listing the buildings' height in ascending order we have; Marina, Wuhan center, Zifeng Tower , Shangai Tower

The reasoning behind this can be mathematically explained in terms of the z-score. The standard score of the heights of the building give us an insight as to how tall the buildings can be.

Since they are in the same population i.e building heights, the higher the z-score, the higher the height of the building. A positive z-score indicates a height taller than the average while a negative z-score indicate a height lower than the average height which is the mean

6 0
3 years ago
What is the average rate of change of the function f(x) = x^2 on the interval from x=2 to x=4?
Ghella [55]
The answer is c
Step by step:
7 0
3 years ago
Number 3 please , thanks!
Doss [256]
The inequality would be 34 > 2 x 3, if I'm correct. I'm not to sure on the graph part though , sorry.
4 0
3 years ago
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