13 In the xy-plane, if the parabola with equation y = + bx + c, where a, b, and c are constants, passes through the point (-1, 1), which of the following must be true? A) a - b = 1 B -b+c= 1 C) a + b + c = 1 D) a - b+c= 1​

an altitude of 15,000 feet

step-by-step explanation:

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation:

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: