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The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?