Determine the number of integer solutions to the inequality 2.1 +2.2 < 40 for which:
(a) x_1 and x_2 are non-negative integers.
(b) 3 \leq x_1 \leq 30 and 2 \leq x_2 \leq 20

What is the solution set of the quadratic inequality x^2-5< or equal to 0

What is the expression in factored form? -x^2 + 3x + 28 a. (x-7)(x-4) b. -(x-7)(x+4) c. (x+4)(x+7) d. -(x-4)(x+7)

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.