Question

(9) Divide the sum of 65/12 and 8/3 by their difference.
(10) Find a rational number between 1/4 and 1/3.
(11) The product of two fractions is 9( 3/5) .If one of the fraction is 9(3/4),find the other.

(12) Find the value of (2^0+3^2)x3^2
(13) (2^3n- ^1 +10)÷7 = 6, then find the value of n.
(14) Show that 1225 is a perfect square.
(15) Write a Pythagorean triplet whose smallest member is 14.
(16) Find the value of (57)^2, using the diagonal method.
(17) The sides of a rectangle are in the ratio 5 : 4 and its perimeter is 90 cm.
find its length and breadth.
(18)The three angles of a quadrilateral are 76°,54° and 108° find the measure of the
fourth angle.
(19) Factorise, 9a^2-b^2 + 4b-4.
(20)Find the product of (2x^2 - 5y^2) * (x^2 + 3y^2)​

Answer 1

(ii) x2 -32x2 -x -12x +32=-12x2 - 32x + 32 (iii) 7 + 7 - 2x -x - 5x + 5y + y - 3y = 14 - 8x -3y (iv) ... Find the products: 3a2 × 8a4 ... Find the value of (−8u2v6) × (−20uv) for u = 2.5 and v = 1.