Select all proper fractions. 27/51 12/13 13/5 1/4 4/3

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

Which of the following lines does not intersect the line y=-2x+3 ? a) y=2x b) y=2x-3 c) y=2x+3 d) y=-2x-3

Ntriangle abc, m∠a = 35° and m∠b = 40°, and a=9. which equation should you solve to find b?