`(-4)/(7)+(2)/(9)+(-5)/(4)+(8)/(21)`

Simplify: ((4)/(7)+(-8)/(9) +(-5)/(21) +(1)/(3)) .

The value of (5^((1)/(4))-: (3)/(7)"of"(1)/(2)) -: (5(1)/(9)-7(7)/(8)-: 9 (9)/(20)) xx(11)/(21)+ (2-: 2 "of" (1)/(2)) is :

Simplify : [ ((- 3 )/( 2) xx (4)/(5) ) + ((9)/(5) xx (-10)/( 3)) - ((1)/(2)xx (3)/(4)) ] div [ ((21)/( 9) xx (3)/(7)) +((7)/(8) xx (16)/(14)) ]

(3)/(5) "of" (4)/(7) "of" (5)/(9) "of" (21)/(24) "of" 504=?

(3)/(2!)+(5)/(4!)+(7)/(6!)+(9)/(8!)+....=

Use the distributibity of multiplication of rational numbers over their addition to simplify: 2/7×(7/(16)-(21)/4) (ii) 3/4\× (8/9-40)

Find the area of the triangle whose vertices are given below : (i) (-3,-4), (-2,-7), (-1,-9) (ii) (3,8),(-4,2), (5,1) (iii) (2,1), (3,2), (-1, 4)