Astudent researcher conducts an experiment that investigates the effects of a new mathematics website on student achievement. she randomly assigns students to two groups: one that receives supplemental instruction from the website and one that doesn't receive the supplemental instruction. each sample consists of 20 students. observations of student engagement are rated by the researcher, according to an engagement scale. how could this study be improved?

select all that apply.

a. have another researcher provide ratings, as well.

b. administer a quiz or exam that gauges student understanding.

c. increase the sample size.

d. limit observations to students who are engaged.

saving = more money

step-by-step explanation:

if you have 100 bucks, and you want to buy a candy bar, even if you have one at home, if you choose not to buy it, you save.

~courtney

24 units

step-by-step explanation:

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!

answer: the is put the 450

step-by-step explanation: