A chemist needs a 30% iron alloy. How many grams of a 70% iron alloy must be mixed with 16 grams of a 20% iron alloy to obtain the requiered 30% alloy?

What is 3x - 7 = 8x + 23

Maria is weighing a glass jar filled with marbles. The weight of each marble is 4 grams and the weight of the empty jar is x grams. There are 72 marbles in the glass jar and the total weight of the marbles and the glass jar is 703 grams.

Write the equation of the line with slope of 2 and y-intercept (0, 15).

What is the simplest form of the ratio 18b^2 to 45b

Joshua has 7 different varieties of tulips in his garden. If he has 385 tulip plants in total and equal numbers of each variety, how many of each tulip variety does he have?

What 2 numbers have an absolute value of 4 * A 4 and 16 B 4 and - 4 C 2 and 4 D - 2 and - 4

Identify the next three terms in the geometric sequence 5, 10, 20, 40, ...

What is 370,000,000 is scientific notation?

What is the height of the following triangle if the area is 60 square meters

Solve for v. 2y = 18-41 Simplify your answer as much as possible.