Ubuntu wishes to strengthen 30mL of 2% salt solution to mix that is 6% salt. How much 12% salt solution should he add to accomplish this?

Nneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?