T Write the ratios in simplest form.
10. 18
11. 21 to 14
12. 15:25
Write = if the ratios form a proportion; if they do not form a proportion,
write +
13. 12
14. 20:24 I 24:30
15. 16 to 20 I 28 to 35

(a) calculate the molarity of a solution that contains 0.0345 mol nh4cl in 400 ml of solution. (b) how many moles of hno3 are present in 35.0 ml of a 2.20 m solution of nitric acid? (c) how many milliliters of 1.50 m koh solution are needed to supply 0.125 mil of koh ?

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)