(HELP) Planes Q and R are parallel planes. Plane Q contains line a. Plane R contains line b. If a third plane could be drawn which contains both lines a and b, then

-lines a and b must be parallel.

-lines a and b cannot be parallel.

-lines a and b must be skew.

-lines a and b must be perpendicular.

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

Aflower has 26 chromosomes. to create a new flower, how many chromosomes would a sperm cell have? what is this process called? part 2: within a flower cell that has 26 chromosomes, how many chromosomes would a cell that is created within the stem of a flower as it grows, have? what is this process called?