In the rhombus m1 = 10x, m2 = x + y, m3 = 18z. find the value of each variable
b)10% of 40%=3560/4=890
127 is rational
the number 127 is rational because it can be expressed as the quotient of two integers p and q in the form:
which can be represented as
while if the number is , then it would be irrational because the square root of 127 gives a decimal number that goes on and on and cannot be represented as a fraction.
the correct answer is option c
in this question first we use the sum and difference formula :
cos (a-b) = cos(a) cos(b) + sin (a) sin (b)
let a = 180 and b = q, then
cos (180-q) = cos (180) cos (q) + sin (180) sin (q)
now the sin of 180 degree is 0. since 0 multiplying with anything leaves 0, this makes sin (180) sin (q) = 0
cos (180-q) = cos (180) cos(q)
now the cos of 180 degree is -1.
cos(180-q) = -1 cos(q), or cos (180-q) = -cos(q)