IGCSE Mathematics Paper-1: Specimen Questions with Answers 68 - 71 of 324
Question 68
Describe in Detail
Essay▾A ramp from a parking to a shopping mall slopes upward at an angle of to the horizontal. The length of the slope is 15 meters. Find difference in height h between the parking and the shopping mall. Give answer in meters.
Explanation
Here, as given angle A is , AC = 15 m and we need to find length of BC which is difference of the height of mall and parking.
So, by using formula:
Question 69
Question 70
Write in Short
Short Answer▾(a) Find the value of y when .
(b) Make r the subject of the formula.
Explanation
Here, equation is where,
(a)
(b)
Question 71
Write in Short
Short Answer▾(a) The surface area of the earth is . Write this number to 3 significant digits.
(b) 72.2% of the surface area of the earth is water. Calculate the area of water.
Explanation
Here,
(a) The surface area of the earth is
So, correct it to 3 significant digits we will get: because after 0 there is 1 which is less than 5, so 0 will remain same.(b) 72.2% of the surface area of the earth is water.
So, here surface area 100 %= 510 million
Then 72.2 %= ?
So, surface area of water on earth which is sphere = .
So, for area of water on earth is: