A right triangle has acute angles a and b, where the measure of angle a=70 degrees. Which of the expressions below are correct for this right triangle? A. cos(a)=sin(70)

B. tan(a)=tan(20)

C. sin(a)=cos(70)

D. sin(a)=cos(20)

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.

Given the equation y − 4 = three fourths(x + 8) in point-slope form, identify the equation of the same line in standard form. −three fourthsx + y = 10 3x − 4y = −40 y = three fourthsx + 12 y = three fourthsx + 10

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x