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1. sally said that when you add or subtract positive or negative decimals, you can change the order of the decimals and still get the same answer.
use these decimals to answer the questions:
–6.2, 5.71, –3.96, 2.84

(a) is sally’s statement always true, sometimes true, or always false? write two pairs of equations using addition and two pairs of equations using subtraction to support your answer.
(b) write a rule about changing the order of the numbers in adding and in subtracting positive and negative decimals.
is sally’s statement true for addition and subtraction of three positive or negative decimals? write two pairs of equations (one pair for addition, and one pair for subtraction) that support your answer.

Scenario: a rectangular plot of ground is 5 meters longer than it is wide. its area is 20,000 square meters. question: what equation will you find the dimensions? note: let w represent the width. options: w(w+5)=20,000 w^2=20,000+5 (w(w+5))/2=20,000 w+2(w+5)=20,000

Rewrite the equation x = 65 - 60p by factoring the side that contains the variable p.

Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.