Ricardo says that the expression y+4 is equivalent to the expression 1y+4. is he correct. explain

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?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

An engineer scale model shows a building that is 3 inches tall. if the scale is 1 inch = 600 feet, how tall is the actual building?