13. Which equation represents y = x2 - 10x + 30 in vertex form? y = (x - 5)2 + 5
y = (x – 5)2 + 55
y = (x – 5)2 - 5
y = (x - 5)2 + 30

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Abcd is a parallelogram. the diagram is not drawn to scale. if m

Which of the following is an equation of a line parallel to the equation y=4x+1?