Question

plzz solve. 7.8.9.10.11.12

Answer 1

Answer:

Step-by-step explanation:

Q.7

x+2 / x-1 = 5/2

use Cross multiplocation

2(x+2) = 5 (x-1)

2x + 4 = 5x -5

3x =9

x=3

Q.8 0.12 can be written as 12÷100

percentage = number× 100

= 12/100 × 100

answer : 12%

Q.9 A perpetuity is a type of annuity that recevies an infinite amount of peroidic payments .

P = D/R

Q.10. 1 degree = 180/ pi radian

1 radian = pi /180 degree

7 pi /12 radian= 7pi / 12 × 180/pi deg

= 105 degree

Q.11 average = sum / total number

total boys = 10

average = sum of age /10

average is given as 13

13 = sum /10

sum = 13 ×10

= 130

answer : 130

Q.12 slope of a line perpendicular is negative reciprocal of it .

so slope = 3/2