21-20i

sum_(n=1)^(20)[sin((2n pi)/(21))-i cos((2n pi)/(21))]=

Simplify: (i) (-4/7) xx (21/20) , (ii) (-13)/9 xx (-21)/(-39)

(-22)+21+(-22)+21+. . 20 terms is equal ...........

(-22)+21+(-22)+21+. . 20 terms is equal ...........

The lengths in centimetres (to the nearest centimetre) of 30 carrots are given as follows: 15, 22, 21, 20, 22,15, 15, 20, 20,15, 20, 18, 20, 22, 21, 20, 21, 18, 21, 18, 20, 18, 21, 18, 22, 20, 15, 21, 18, 20 Arrange the data given above in a table using tally marks and answer the following questions. What is the number of carrots which have length more than 20 cm?

The lengths in centimetres (to the nearest centimetre) of 30 carrots are given as follows: 15, 22, 21, 20, 22,15, 15, 20, 20,15, 20, 18, 20, 22, 21, 20, 21, 18, 21, 18, 20, 18, 21, 18, 22, 20, 15, 21, 18, 20 Arrange the data given above in a table using tally marks and answer the following questions. Which length of the carrots occur maximum number of times?Minimum number of times?

If cottheta = frac(21)(20) , then what is the value of sectheta ? (A) frac(29)(21) (B) frac(21)(29) (C) frac(29)(20) (D) frac(20)(29)

If the mode of 22,21,23,24,21,20,23,26,x and 26 is 23, then x=20( b) 2123(d)24

Write the conjugate of the complex numbers (15+3i)-(4-20i)

Prove that the points, represented by complex numbers (5+8i),(13+20i),(19+29i) are collinear.