each of the numbers x, y, and z is greater than 1 and less than 10 x*10^5+y*10^4=z*10^5 give an expression for z in terms of x and y.

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?