Se vendieron un total de 90 entradas para un concierto y los organizadores ganaron $ 806. Si el costo de cada boleto es de $12 o de $14, ¿cuantos boletos de cada tipo se vendieron?

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.

Drag each expression to the correct location on the solution. not all expressions will be used. consider the polynomial 8x + 2x2 - 20x - 5. factor by grouping to write the polynomial in factored form.

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)