Photo necessities produces camera cases. they have found that the cost, c(x), of making x camera cases is a quadratic function in terms of x the company also discovered that it costs $28 to produce 2 camera cases, $50 to produce 4 camera cases, and $140 to produce to camera cases. find the total cost of producing 12 camera cases

Can someone me and do the problem plz so i can understand it more better

How many triangles can be drawn with side lengths 4 centimeters, 4.5 centimeters, and 9 centimeters? explain

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?