Length:
1 inch = 2.54 centimeters
1 foot = 12 inches
1 yard = 3 feet
1 mile = 1,760 yards
Combinations
WS#1G9
- In a game,
there are 10 players, and the coach needs to choose a captain and a
vice-captain. How many different combinations of captain and vice-captain are
possible?
- A school has 5 different clubs, and each student can join only one club. If there are 25 students in the school, how many different ways are there for the students to join the clubs?
Equation of parabola from graph
Transformed equation of parabola is:
\(y=af(x-h)^2+k\) \(……(1)\)
Where \(a=\)Vertical stretch or compression,
\(h=\)horizontal shift (left or right)
\(k=\)Vertical shift (up or down)
From graph, \(h=3\) and \(k=-2\);
plug \(h\) and \(k\) values in eqn \((1)\)
\(y=a(x-3)^2-2\) /(……(2)\)
To find \(‘a’\), use the given point \((1,0)\) as:
\(0=a(5-3)^2-2\)
\(0=4a-2\)
\(a=1/2\);plug in eqn.(2)
\(y=1/2 (x-3)^2-2\);which is the reqd.eqn.
Trigonometric Co-ratios
Learn to convert and use trigonometric co-ratio functions to solve trigonometric problems.
Operations with integers
Absolute value: A number's absolute value is its numerical value without taking the sign into consideration, and it is represented by the sign \(|a|\); where a is any number.
\(e.g.\)\(|a|=a\) and \(|-a|=a\)
Water pollution
What is water pollution?
Water pollution is when waste, chemicals, or other particles cause a body of water (i.e. rivers, oceans, lakes) to become harmful to the fish and animals that need the water to survive.
What causes water pollution?
- Volcanoes
- Algae blooms
- Animal waste
- Silt from storms and floods.
Air Pollution
What is air pollution?
Air pollution is when unwanted chemicals, gasses, and particles enter the air and the atmosphere causing harm to animals and damaging the natural cycles of the Earth.
What causes air pollution?
Natural causes:
- Eruptions of volcanoes
- Dust storms
- Forest Fires
Human activities responsible for air pollution: