Mathematics (26 Nov)

Mathematics

(26 Nov 2020)

Revision (Direct and Inverse Proportions)

Materials:

• A4 paper

• stationeries

• calculator

Instructions :

• Questions will be projected.

• You need to write proper working method for each and every question in a piece of paper.

• Once you're done with the question you need to turn on your camera and show your working to the camera.

• Everyone must participate.

• Do not not post your answer at "CHAT"

• You will be given 30 seconds for each questions.

Multiple Choice

a = 70 rounded to the nearest 10

b = 6.6 rounded to one decimal place.

What are the lower and upper bounds of a/b

• 9.17 and 9.92

• 11.5 and 9.92

• 9.77 and 11.45

• 9.77 and 11.28

Multiple Choice

The distance travelled by an object is 18 metres in a time of 1.8 seconds. Both measurements have been given correct to 2 significant figures. Calculate the minimum and maximum possible speed of the object in m/s.

• 9.75 and 10.35

• 9.5 and 10.5

• 9.46 and 10.57

• 10 and 9

Multiple Choice

A is inversely proportional to the cube of B

• $A\propto\frac{1}{B}$

• $A\propto\frac{1}{B^2}$

• $A\propto\frac{1}{\sqrt{B}}$

• $A\propto\frac{1}{B^3}$

Multiple Choice

A is inversely proportional to the square of B

• $A\propto\frac{1}{B}$

• $A\propto\frac{1}{B^2}$

• $A\propto\frac{1}{\sqrt{B}}$

• $A\propto\frac{1}{B^3}$

Multiple Choice

Suppose y varies inversely with x.
If y = 150 when x = 2, find y when x = 25.

• 300
• 75
• 1,875
• 12

Multiple Choice

If q is inversely proportional to p² and q=3 when p=5, find an equation connecting p and q.

• $q=\frac{3}{25}\ p^2$

• $q=\frac{3}{25}\ p$

• $q=\ \frac{75}{p}$

• $q=\ \frac{75}{p^2}$

Multiple Choice

 Y varies directly with x, and y is 84 when x is 16. Which equation represents this situation?

• y=1344x
• y=100x
• y=5.25x
• y=4/21x

Q&A Session

Anything to ask or clarify????

Topic suggestion for tomorrow

???