Write in another form 6(a+5-1/2 c)

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?