Patrick is learning about quadrilaterals. He was given the following true statements: • Opposite sides of all parallelograms have the same length.
• Opposite sides of all rectangles have the same length.
• All sides of a square have the same length.
• All rectangles are parallelograms.
• All rectangles have right angles.
• All squares have right angles.
Based on this information, Patrick assumes the following statements are always true. Which
statement is not supported by the given information?
A All squares are rectangles.
B All squares are parallelograms.
C All parallelograms are rectangles.
D All parallelograms are quadrilaterals.

Which of the following contains a variable?

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y

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.