Acircular pond 20 meters in diameter is surrounded by a gravel path 5 meters wide the path is to be replaced by a brick walk costing 30.00 per square meter. how much will the walk cost? ?

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.