How many lines of symmetry does a heart have

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe

How would you find the height of points on the circle? the topic is trigonometry.