The mean of the masses of a group of four students is 30 kg. One student joins the group. The mean of the masses og the five students is 32 kg. Find the mass of the student who joined the group.

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?

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?