The four sides of a printed circuit board (PCB) enclosure consist of two pieces selected from a population whose mean length is 30 cm with standard deviation 0.14, and two pieces selected from a population whose mean length is 45 cm with standard deviation 0.31 cm. Assuming the four pieces are chosen independently, the standard deviation of the perimeter is

7(x - 2) = 3(x + 4) solve the following equation. then enter your answer in the space provided using mixed number format.

Assume that 1400 births are randomly selected and 1378 of the births are girls. use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high. choose the correct answer below. a. the number of girls is neither significantly low nor significantly high. b. the number of girls is significantly high. c. the number of girls is significantly low. d. it is impossible to make a judgment with the given information.

Combine like terms to make a simpler expression 3z+z