F(t)=212-6t What is the value of t when f(t)=140

t=12

Step-by-step explanation:

140=212-6t

-212 -212

-72/-6=-6t/-6

t=12

1/4 because there is 4 grades.

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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