Question

please send all 5 answer please​

Answer 1

Answer:

Solutions

10)

x² -2x - 8 = 0

D = b² - 4ac

D = 4 - 4(1)(-8)

D = 4 + 32

D = 36

√D = √36 = 6

by quadratic formula

x = (-b ±√D)/2a

x = (2±6)/2

x = 8/2 or x = -4/2

x = 4 or x = -20

11)

√(3x² + 6 ) = 9

(3x² + 6 ) = 81

3x² = 75

x² = 25

x = ±5

x = 5 or x = -5

12)

tan²10 - cot²80

tan²10 - cot²(90-10)

tan²10 - tan²10

= 0

13)

mode = 50.5

median = 45.5

by emperical formula

3 median = mode + 2 mean

3(45.5) + 50.5 + 2mean

2mean = 136.5 - 50.5

mean = 86/2

mean = 43

14)

by bpt

AC/AD = BC/BE

12/7 = 18/BE

BE = 18 x 7/12

BE = 3 x 7 /2

BE = 21/2 = 10.5cm

#Hope this will help you