A chemist is logging the decay of two different substances. The number of grams in Substance A is
represented by f(t) = 50(0.92) and Substance B is represented by f(t) = 90(0.5386)2 in days.
a. Identify the initial amount of substance A and Substance B.
Substance A
Substance B
b. What percent of each substance decays each day?
Substance A
Substance B

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (-4, 0) and (6,0). the y-intercept of thefirst parabola is (0, –12). the y-intercept of the second parabola is (0-24). what is the positive difference between the avalues for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth.

Solve the triangle. a = 21°, c = 105°, c = 5

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x