PLS HELP ME WITH GEOMETRY PLSAND THANK YOU

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

Arecipe calls for 32 fluid ounces of heavy cream.how many 1 pint containers of heavy cream are needed to make the recipe?

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie