Which parallelograms have perpendicular diagonals?
a. rectangle, rhombus
b. square, rhombus
c. square, rectangle
d. none

What’s the range cuz i can’t find it?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

Which number is located at point a on the number line? a number line is shown from negative 10 to 10 with each interval mark on the number line representing one unit. point a is labeled one interval mark to the right of negative 5.