Question

Find the value of an expression: 2ab +4b+c if a= 10 b=5 and c=3

12)Express 9000 as product of powers of the prime factors. 13)Find the area of circle whose radius is 7 cm

14)A bag contain 4 red balls 5 blue balls and 1 black. (a) Find the probability of getting a red ball

(b) Find the probability of getting a green ball. 15)Solve: 4x =-2x +30

III. ANSWER ALL THE QUESTIONS 5 x 4 =20

16)Form the equation and solve:

(a) Three times a number is 60.What is the number?

(b) A number is decreased by 10 is 40.Find the number.​

Answer 1

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Answer 2

Given,

a = 10

b = 5

c = 3

2ab + 4b + c = 2 x 10 x 5 + 4 x 5 + 3

= 100 + 20 + 3

= 123

16)b) The number is 30.