e 3. form Ans CUse H tnt dt fnachons

1. A lead block has dimensions 8 mm by 6 mm by 2mm. To add value, the block will be covered in a uniform layer of silver on all 6 faces. The layer will be t mm thick. The volume of silver required is given by V(t) = (8+2t)(6+2t)(2+2t)-96. If 224 mm3 of silver are used, how thick is the silver coating?

3. y+y - casx Ans.

1. If y² = 10x, then A. C. - 5 2xy 1 2x d²y dx² = 10X B. D. 5x 2y - 5xy 2

14. Evaluate 4x - 4 a. S: e-2x-9 dx b. 5-4x St VE? + 2 dt C. d. dx

12.

1. Solve for the variable x. F = kx – kxo F-kxo A. x = F-Kxo B. x = k F+ kxo c. O C. x=: F+ kxo O D. x=' k

1. A rectangular piece of cardboard has dimensions 30 cm by 20 cm. Strips of width x cm and y cm are cut off the ends, as shown in the diagram, so that the remaining cardboard has an area of 450 cm2. 30 cm 目 y cm 20 cm 450 cm2 I cm a) Find an expression for y In terms of x in the form ax -b y = %3D CX-d'

15. CS² Y xyer² dxdy

5. Evaluate: T dzdy dx 8 а. 3 b. 0 4 с. -- 3 5 d. 2 e. None of these