Which statement is true concerning the vertex and the axis of symmetry of g(x)=5x2−10x?
a) the function written in vertex form is g(x)=5(x−1)2−5. the vertex is at (1, –5) and the axis of symmetry is .
b )the vertex is at (1, –5) and the axis of symmetry is y = 1.
c) the vertex is at (0, 0) and the axis of symmetry is x = 1.
d) the vertex is at (0, 0) and the axis of symmetry is y = 1.

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?