25 ! find first differences for the sequence in order from a1 to a5. determine whether or not the series is quadratic or not. -1, -3, -1, 5, 15 a) 2, 2, 6, 10; not quadratic b) 2, 2, 6, 10; quadratic c) -2, 2, 6, 10; not quadratic d) -2, 2, 6, 10; quadratic

3(10x-y)-5(x-y^2) need this solved asap

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Agraph of a trapezoid can have diagonals with slopes that are negative reciprocals and two pairs of adjacent sides that are congruent, true or false, and why