The substance that is added to make natural rubber

Let A={1,2,3}, and B={x ∈ Z ∣ 1≤x≤4}. The total number of injective functions from A to B is:

A man travels 60 km at a speed of 30 km/h and then travels 90 km at a speed of 60 km/h. What is his average speed for the entire journey?

Solve: 2^(x+3) = 8^(x–1)

Find the equation of the line passing through the point (3, 4) and having a slope of 2.

The ratio of the ages of A and B is 3:4. Five years later, the ratio of their ages will be 4:5. What are their present ages?

Find the median of the set of the numbers given below:

13,11,9,7,15,14,12,8,5,9,10

If the ratio of the ages of A, B, and C is 2:3:5 and the sum of their ages is 50 years, what is the age of the youngest person?

A cone has a base radius of 6 cm and a height of 8 cm. Find its volume and slant height (use π = 3.14).