Use this information to find the value of b. c = 25

s = 9

b = 4c - s2

​

b=4*25‐9*2

=100‐18

=82

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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