How to do percentages changes

Are these ratios 2/4 and 20/36 proportional and how do i show the work

13[6^2 / (5^2-4^2) + 9] simplified form of the expression

5. 4x2 - 31x + 21 Factoring

Plate tectonics explains which of the following? a. trenches b. ocean currents c. mudslides d. tornadoes

What if you have a whole number in front of the fraction

what is the solution set to x if < x < 6 A. 1, 2, 3, 4, 5 B. 0, 1, 2, 3. 4. 5 C. 1, 2, 3, 4, 5, 6 D. 0, 1, 2, 3, 4, 5, 6

Identify the dependent and independent variables on the following scenario: A researcher is studying the effect of sleep on academic performance, thinking that less sleep will lead to lower grades.

Where does the decimal go in 288

Which problem can be solved using this equation? 2 5 b = 4 A) Kyle's class is making banners for a fund raiser. They have 4 yards of material. How many banners can they make? B) Kyle's class is making banners for a fund raiser.

Is 12.52 (rounded to 2 d. p.) is rational or irrational