In a certain chemical, the ratio of zinc to copper is 4 to 19. a jar of the chemical contains 684 grams of copper. how many grams of zinc does it contain?

Suppose you want just guess at the answers in a 5 question multiple-choice test. each question has 3 responses and only one is correct. what is the probability of getting two questions right just guessing? 20 points 0.3275 0.2753 0.7532 none of the above

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers