A rhombus has 10-in. sides, two of which meet to form the indicated angle.
Find the area of the rhombus.(Hint: Use a special right triangle to find height.)

The angle is 60

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Which of the following parabolas opens down?

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z