Work out the surface area of the triangular prism
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Given: △abc, ab=15, bd=9 ad ⊥ bc , m∠c=30°. find: the perimeter of the triangle.

The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?