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Ivenika [448]
3 years ago
8

Simplify: -5 1/4 - (-7 1/2)

Mathematics
1 answer:
Juliette [100K]3 years ago
8 0
-5.25 -(-7.5) (Conversion to decimals cuz' it's easier for me to type)
-5.25 + 7.5 (Subtracting a negative is like Adding a Positive)
7.5 - 5.25 (Rearranging)
2.25 (Subtracting)
2 1/4 Final Answer.

To do it w/o converting to decimals, make sure the fractions have the same denominator.
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Determine the volume of the solid that lies between planes perpendicular to the x-axis at x=0 and x=4. The cross sections perpen
OverLord2011 [107]

Answer:

Volume = 16 unit^3

Step-by-step explanation:

Given:

- Solid lies between planes x = 0 and x = 4.

- The diagonals rum from curves y = sqrt(x)  to  y = -sqrt(x)

Find:

Determine the Volume bounded.

Solution:

- First we will find the projected area of the solid on the x = 0 plane.

                              A(x) = 0.5*(diagonal)^2

- Since the diagonal run from y = sqrt(x) to y = -sqrt(x). We have,

                              A(x) = 0.5*(sqrt(x) + sqrt(x) )^2

                              A(x) = 0.5*(4x) = 2x

- Using the Area we will integrate int the direction of x from 0 to 4 too get the volume of the solid:

                              V = integral(A(x)).dx

                              V = integral(2*x).dx

                               V = x^2

- Evaluate limits 0 < x < 4:

                               V= 16 - 0 = 16 unit^3

3 0
3 years ago
Solve 3(2x-5)-4x+8=-1
777dan777 [17]

Answer:

6

Step-by-step explanation:

Step 1:

3 ( 2x - 5 ) - 4x + 8 = - 1

Step 2:

5x - 15 - 4x + 8 = - 1

Step 3:

x - 15 + 8 = - 1

Step 4:

x - 7 = - 1

Answer:

x = 6

Hope This Helps :)

7 0
3 years ago
At a competition with 8 runners, 2 medals are awarded for first and second
Dafna1 [17]

Answer: Option 'A' is correct.

Step-by-step explanation :

Since we have given that

Number of medals = 2

Number of runners = 8

We need to find the number of ways to award the medals.

We would use "fundamental theorem of counting" to find the number of ways.

So, number of ways is given by

8 × 7 = 56

Hence, option 'A' is correct.

4 0
3 years ago
Read 2 more answers
What is the reciprocal of 0.125
lesya692 [45]
1/0.125
I really hope this helps
6 0
2 years ago
Find the circumference of the circle below to the nearest tenth Use 3.14 for a
AnnyKZ [126]

Answer:

125.6

Step-by-step explanation:

all you have to do is multiple the 3.14 with 40 cm to get 125.6 cm

8 0
2 years ago
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