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ExtremeBDS [4]
2 years ago
9

B -2(b - 2) simplified

Mathematics
1 answer:
BlackZzzverrR [31]2 years ago
5 0

Answer:

b -2(b - 2)

b-2b+4

-b+4

4-b

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Q2.
Nimfa-mama [501]

Answer:

see below

Step-by-step explanation:

A = {8, 9, 10, 11, 12, 13, 14} and   B = {2, 4, 6, 8, 10, 12, 14, 16, 18}

----------------

(i) List down the elements of A’ and B’

{8, 9, 10, 11, 12, 13, 14, 2, 4, 6, 8, 10, 12, 14, 16, 18} - this is the elements of both sets

----------

(ii) Are sets A - B and B - A equal sets?

A-B= {9, 11, 13}

B-A= {2, 4, 6, 16, 18}

These are not equal as we can see

----------

(iii) Find and compare the sets (AUB)’ and A’∩B’ and share your observations

A∪B= {2, 4, 6, 8, 9, 10, 11, 12, 13, 14, 16, 18}- union included all elements of both sets

A∩B= {8, 10, 12, 14} - intersection only includes common elements

7 0
3 years ago
find the curved surface area and total surface area of a right circular cylinder whose height is 15 cm and the radius of the bas
otez555 [7]

Answer:

CSA = 660cm^2 --- Curved Surface Area

TSA = 968cm^2  --- Total Surface Area

Step-by-step explanation:

Given

Shape: Cylinder

h = 15 -- height

r = 7 --- radius

Solving (a): The curved surface area (CSA)

This is calculated as:

CSA = 2\pi rh

This gives:

CSA = 2 * \frac{22}{7} * 7 * 15

CSA = 2 * 22* 15

CSA = 660cm^2

Solving (b): The total surface area (TSA)

This is calculated as:

TSA = 2\pi r(h + r)

This gives:

TSA = 2 * \frac{22}{7} * 7 * (15 + 7)

TSA = 2 * 22 * (15 + 7)

TSA = 2 * 22 * 22

TSA = 968cm^2

6 0
2 years ago
Sarah is saving money to buy a camera that costs $189. She saved $99 so far. She is also planning on saving $10 a week. In how m
inna [77]

Answer:

9 more weeks!

if you add 10 each week you find out.

Step-by-step explanation:

1 more week will be $109, 2 more weeks will be $119, 3 more weeks, $129, 4 more weeks $139, 5 more weeks will now be $149, the 6th week is $159, the 7th week is $169, the 8th week is $179, the 9th week will be $189. $189 is precisely what she needs for the camera.

4 0
3 years ago
Hoses A and B spout water at different constant rates, and hose A can fill a certain pool in 6 hours. Hose A filled the pool alo
Naddik [55]

Answer:

18 hours

Step-by-step explanation:

Let the volume of the pool be x. Since pipe A filled the  pool in 6 hours, the rate of pipe A = x / 6.

Let the rate of pipe b be y, Hose A filled the pool alone for the first 2 hours, this means that the volume filled in the 2 hours is x/6(2 hours) and the two hoses, working together, then finished filling the pool in another 3 hours for the 3 hours the volume filled is x/6(3) + y(3).  hence the total time is:

x/6(2) + x/6(3) + y(3) = x

x/3 + x/2 + 3y = x

Multiply through by 6:

2x + 3x + 18y = 6x

5x + 18y = 6x

18y = x

y = x/18

The rate of pipe B is x/18, this means it would take pipe B 18 hours to full the pool alone

8 0
3 years ago
In certain chemical,the ratio of zinc to copper is 3 to 17 A jar of the chemical contains 493 grams of copper
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3 years ago
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