What is the value of c when the expression 21.2x + c is equivalent to 5.3(4x − 2.6)?

Evaluate cos2θ for cosθ = square root of 3/2

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.