Assignment I. If 9^1-x= 27 and x-y = -1½ find the value of x+y.

2.2^1-y x 2^y-1 / 2^y+2= 8^2+3y . find y.

3. If 2^x+y= 16 and 4^x-y= 1/32 Find x and y.

4.Solve 1 / 81^<x-2> =27<1-x>

5.Solve the equ 9^2x-3 / 3^x+3 = 1
6. Simplify 1/3^5x x 9^n-1 x 27^n-1

7. If 9^<2-x> = 3. Find x.

8.If 27^x =9y. Find the value of x/y.

9. If 2^n=12^d find the value of (2^n-1) (5^n-2)

10.If 9^2x = ⅓ (27^x). Find n.

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )