If AB=4x+5 and BC=9x-40, find the value of x and the length of AC.

Can someone me out here number 4 plz

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation

Use the chart to multiply the binomial by the trinomial. what is the product? y3 + 27 y3 – 27 y3 – 6y2 + 27 y3 + 6y2 + 27