The sum of the first terms of an AP is 520. If the 7th term is double of the 3rd term. Calculate the first term, common difference and sum of 20 terms

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?

The graph shows the function f(x) = (2.5)x was horizontally translated left by a value of h to get the function g(x) = (2.5)x–h.

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.