Question

Please help and good night​

Answer 1

(7) n = ⁴/₃

(8) x = -5

(9) d = ³/₂

(10) v = -20

Explanation:

(7)
`n-(8)/(9) = (4)/(9)`

`n-(8)/(9) = (4)/(9) \\\\Collect \ similar \ terms \ together\\\\n = (4)/(9) + (8)/(9) \\\\n = (4+8)/(9) \\\\n = (12)/(9) \\\\n = (4)/(3)`

(8)

`(3)/(2) + \ x = -(7)/(2)\\\\collect \ similar \ terms \ together\\\\x = -(7)/(2) -(3)/(2) \\\\x = (-7-3)/(2) \\\\x = (-10)/(2) \\\\x = -5`

(9)

`(6)/(5) = (d)/(((5)/(4) )) \\\\cross \ and \ multiply\\\\5d = 6((5)/(4) )\\\\5d = (30)/(4) \\\\d = (30)/(4* 5) \\\\d = (30)/(20) \\\\d = (3)/(2) \\\\d = 1(1)/(2)`

(10)

`-(1)/(8) v = (5)/(2) \\\\(-v)/(8) = (5)/(2) \\\\cross \ and \ multiply\\\\-2v = 40\\\\-v = (40)/(2) \\\\-v = 20\\\\v = -20`