A simple closed curve made up of only line segment is called [a] curve[b] polygon [c] surface [d] concave

Express the following numbers in usual form

I. 3.02 x 10^ - 6

II. 4.5 x 10^4

III. 3 x 10^ - 8

IV. 1.0001 x 10^9

V. 5.8 x 10^12

VI. 3.61492 x 10^6

Write four negative integers greater than -20.

What are examples of non-real numbers?

Find the cube root of 512 by the prime factorization method.

An air conditioner can cool the hall in 40 minutes while another takes 45 minutes to cool under similar conditions. If both air conditioners are switched on at the same time then how long will it take to cool the room approximately?

(A) 18 minutes

(B) 19 minutes

(C) 22 minutes

(D) 24 minutes