Grace and jack share £140 in the ratio 3: 4 work out the amout that jack gets

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 a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs

Solve for x and select the correct answer