Ascientist has two solutions, which she has labeled solution a and solution b. each contains salt. she knows that solution a is 20% salt and
solution b is 80% salt. she wants to obtain 180 ounces of a mixture that is 30% salt. how many ounces of each solution should she use?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?