MATHEMATICS HIGH SCHOOL

What is the surface area of this cylinder?Use a * 3.14 and round your answer to the nearest hundredth.
28 ft
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15 ft
square feet
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What is the surface area of this cylinder? Use a - 1

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Answer 1
Answer: the answer is 2550 square feet

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What is 1/2 × 2/3?I really need help and someone please show me in step i dont understand how to do it

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Hi there! All you do is regular multiplication. 1*2=2 and 2*3=6, if you combine 2 and 6 the fraction would be 2/6. We divide 2/6 by 2, 2÷2=1 and 6÷2=3, which is 1/3. Bascially 2/6 simplified is 1/3. Therefore, your answer is 1/3.
Hey, AbbyRoss232!
Hi, I see you need help with multiplying fractions. I will try my best to help you, and hopefully, you will be excellent at it!

1*2=2
2*3=6
2/6 and that can be simplified as 1/3!
I divided the numerator and denominator by 2 and got 1/3.

At a competition, medals are awarded for first - sixth place. The total number of ways medals may be awarded can be found using a permutation. A. True B. False

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Answer: True

Permutation deals with the number of ways in which objects can be arranged.
Combination deals with the number of ways a smaller group can be selected from a larger group.

The answer to your question would be true since the permutations would deal with how many different ways the medals could possibly be distributed.

Work out the value of (-2)2

Answers

Answer:

this is one of the property

Step-by-step explanation:

(-2)×2=(-4)

hope it helps

Excel remembers the last _____ actions you have completed. 25 50 75 100

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Excel remembers the last 100 actions you have completed.

Microsoft Excel or MS Excel is a spreadsheet developed by Microsoft. It is used in Windows, Mac OS X, iOS, and Androids. It features calculation, pivot table, graphing tools, and macro programming language. 

The distance a spring will stretch varies directly with how much weight is attached to the spring. If a spring stretches 9 inches with 100 pounds attached, how far will it stretch with 90 pounds attached? Round to the nearest tenth of an inch.A. 8.1 in.
B. 8.9 in.
C. 10 in.
D. 9.1 in.

Answers

Answer:

x2 = 8.1 in  (Option A)

Step-by-step explanation:

Given:-

- The extension of spring x1 = 9 in

- The weight hanged F1 = 100 lbs

Find:-

How far will it stretch with 90 pounds attached?

Solution:-

- The linear extension x of spring is proportional to the amount of force F applied to the spring.

                                         F = k*x

Where, k = is the proportionality constant called stiffness of the spring.

- We will first determine the spring stiffness k using the given data as follows:

                                        F1 = k*x1

                                       100 = k*9

                                       k = 100 / 9

- Now, we will determine the amount with which the spring stretches x2 when the hanged weight is changed to F2 = 90 lbs. Using the first relation we plug in the value of proportionality constant (stiffness) k.

                                      F = (100 / 9)*x

                                      F2 = (100 / 9)*x2

                                      90 = (100 / 9)*x2

                                      x2 = 810 / 100

                                      x2 = 8.1 in

- The amount of spring stretches when the applied load of weight hanged is changed to F2 = 90 lbs is x2 = 8.1 in.

Answer A - 8,1in

explanation
  ------------------------------------------------------------------------
  !   Inches        !     Inches    !  Pounds   !       Pounds      !
  !   9 : 10          !       Sum     !                 !          sum        !
  -------------------------------------------------------------------------
  !      0,9          !  0,9*1 = 09  !      10       !      1*10 = 10    !
  ------------------------------------------------------------------------\
  !       0,9          ! 0.9*2 = 1,8 !       10      !      2*10 = 2 0   !
  !       0,9          !                   !        10      !                         !
   -----------------------------------------------------------------------
  !       0,9          ! 0,9*3 = 2,7 !        10     !                         !
  !       0,9          !                   !        10      !      3*10 = 30   !
  !       0,9          !                   !         10     !                         !
  -------------------------------------------------------------------------
  for every pound falls 0.9 inches
derived unit of proportion : 

(9 inches)/(100 pounds) = (0,9 inches)/(10pounds) \n \n = (0,9 * 9 inches)/(10 *9 pounds) = (8,1 inches)/(90pounds) 

2. Which equation is the direct linear variation equation for the relationship? y varies directly with x and y = 10 when x = 2 A. y = x + 8 B. y = 5x C. y = x - 8

Answers

Direct linear variation means y = kx where k is a constant 
Inverse variation means y = k/x 
For the first question y = kx 
We are told y = 10 when x = 2 
Therefore 10 = 2k  k= 5 
which is 5x not x-8
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