What mathematical topic did Brahmagupta not work on? a) the cube of an integer
b) Pell's equations
c) rules to add, subtract, and multiply numbers by zero
d) combinatorial game theory
e) the cube root of an integer
f) the sum of the cubes of the first n natural numbers
g) the sum of the squares of the first n natural numbers

The graph shows the prices of different numbers of bushels of corn at a store in the current year. the table shows the prices of different numbers of bushels of corn at the same store in the previous year. previous year number of bushels price of corn (dollars) 2 10 4 20 6 30 8 40 part a: describe in words how you can find the rate of change of a bushel of corn in the current year, and find the value. part b: how many dollars more is the price of a bushel of corn in the current year than the price of a bushel of corn in the previous year? show your work.

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

You have $600,000 saved for retirement. your account earns 5.5% interest. how much, to the nearest dollar, will you be able to pull out each month, if you want to be able to take withdrawals for 20 years?