If triangle DEF is an isosceles triangle, angle D is the vertex angle, DE = 4x - 7, EF = 3x + 2 and DF = 6x - 15, find the value
of x and the measure of each side.

It costs 4.25 for 1 pound of roast beef. how much will it cost to purchase 2.5 pounds of roast beef? round to nearest cent

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

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