Question

help help me it is for reexam ​

Answer 1

Answer:

Step-by-step explanation:

9) ∠P : ∠Q : ∠R = 2 : 3 : 7 and ∠S = 60°

Sum of the angles 360°

So,the angles are 2x , 3x , 7x , 60° = 360°

2x + 3x + 7x = 360°

12x = 360°

x = 360°/ 12 = 30°

So ,∠P = 2x = 2 × 30° = 60°

∠Q= 3x = 3 × 30° = 90°

∠R = 7x = 7× 30° = 210° is the answer.

10) 5 perfect square numbers = 4,9,16,25,36

Mean of first perfect numbers = 4+9+ 16+ 25+ 36 / 5 = 90/5=18 is the answer.

12) Let (x,y )= (-1, -1)

Given equation 9kx + 12ky = 63

9k × (-1) + 12k × (-1) = 63

-9k - 12k = 63

-21k = 63

k = 63 / -21 = -3 is the answer.

15) The median of observations = 11,12,14,18,x - 4,x - 2,30,32,35,41 =24

11+12+14+18+x-4+x-2+30+32+35+41 /10 = 24

187 + 2x = 24 × 10

187 + 2x = 240

2x = 240 - 187

2x = 53

x = 53 / 2 is the answer.