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3 years ago

What is the value of 3x divided by (10 - x) when 2x + 5 = 85

Mathematics

1 answer:

Reika [66]3 years ago

7 0

Answer:

-4

Step-by-step explanation:

2x + 5 = 85

2x = 80

x = 40

3x/(10-x)

3(40)/(10-40)

120/-30 = -4

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On a test, shelly got approximately 93% of the items correct. she got 76 questions right. how many questions were on the test? a

svetlana [45]

You multiply 76 by 0.93. That is 70.68 which rounds to 71. To check, (71/76) = ~93.

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3 years ago

Find the equation of the line passing through point (-1, -2) and having slope 1/5. Show work.

STatiana [176]

Answer:

Y=1/5x+ -2

Step-by-step explanation:

Hope this helps

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2 years ago

-1<9+n<17 i don't understand how to solve it

Ugo [173]

-1<9+n<17

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3 years ago

17. Which of the following is TRUE? ( 5 points) a. The mean tells us, roughly, how much the data deviate from the average. b. Th

svp [43]

Answer:

c. The Mean of Normal Distribution is related to the average of the data set. The Standard deviation is related to data variation.

Step-by-step explanation:

(a) No, mean don't tell us how much the data deviate from the average, Standard deviation tells us. So, Option (a) is incorrect.

(b) No, mean is greatly affected by extreme values. But Median is good to measure central tendency when there is outlier present in data. So, Option (b) is also incorrect.

(c) Here Mean and Standard deviation are correctly defined. Hence, this is only the correct answer.

(d) No, It is the definition of mean not of Standard Deviation. So, this option is also incorrect.

Further, Mean is used to measure the central tendency of data which represents the whole data in the best way. It can be found as the ratio of the sum of all the observations to the total number of observations.

4 0

3 years ago

If x= 19 feet and y = 12 feet, what is the area and perimeter of the figure above?

Delicious77 [7]

All we need to do to solve this problem is calculate the area of a rectangle and the area of a circle, then add them!

____________________________

First, let's do the rectangle!

Area of a rectangle = length x width

or in this case... Area = "x" times "y"

Area = 19 × 12 = 228 square feet!

________________________________

Now, let's do the circle!

Area of a circle = πr² ... (r = radius)

* In this diagram, the diameter of the circle is also the same length as "y"!

* And remember that radius is half of the diameter.

radius = 6

Now, let's actually calculate the area

Area = π(6)² ⇒ 36π

Area = 113.1 (I rounded up the decimals!)

_______________________________________

*But wait! Look at the figure! It looks like HALF of the circle's area was included when we calculated the area of the rectangle! This means that we should divide the area of the circle (that we just calculated) in half!

Area of the HALF CIRCLE = 113.1 ÷ 2 = 56.5

Now let's add the area of the rectangle to the area of the half-circle to find the area of THE ENTIRE FIGURE!

228 + 56.5 = 284.5

284.5 square feet is our answer!

6 0

2 years ago