One hot air balloon is 15 meters above the ground, and is rising at a rate of 20 meters per minute. a second balloon is 195 meters above the ground , and is descending at a rate of 16 meters per minute. in how many minutes will the two balloons be at the same height?

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb