What was the purpose of the coordinate graphing system described by descartes in his book discourse on method?

a. to use algebraic methods to solve geometric problems.
b. to prove the universe was sun-centered.
c. to represent equations for the queen of sweden.
d. to prove his own existence.

A. To use algebraic methods to solve geometric problems.

Step-by-step explanation:

Descartes, a French mathematician and a philosopher, explained what is  the system of Cartesian Coordinates. In Descartes's system of coordinates, geometry and algebra were united for the first time to create which known as analytic geometry .

Cartesian coordinates are used to plot a point in expanse by giving its respective distance from perpendicular intersecting lines named as x axis and y axis. In coordinate geometry all points, lines, and figures can be drawn in a coordinate plane by references of both the axes.

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.

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step-by-step explanation: