The value of sin (180+x) is equivalent to
a)-sinx
b)-sin (90-x)
c)sinx
d)sin (90-x)

if sec (a+15) =csc (2a) find the smallest positive value of a in degrees.

and q38

For the feasibility region shown below find the maximum value of the function p=3x+2y

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?

Which expression is a perfect cube? a. x8 b. y24 c. m28 d. x64