In preparing for a test on a set of material, is it better to study one topic at a time or to study topics mixed together? in one study,1 a sample of fourth graders were taught four equations. half of the children learned by studying repeated examples of one equation at a time, while the other half studied mixed problem sets that included examples of all four types of calculations grouped together. a day later, all the students were given a test on the material. the students in the mixed practice group had an average grade of 77 , while the students in the one-at-a-time group had an average grade of 38 . what is the best estimate for the difference in the average grade between fourth-grade students who study mixed problems and those who study each equation independently?

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)

3x + 18 = 147°

step-by-step explanation:

3x + 18 = 147°, because the value of the central angle is equal to the value of the arc formed by it.

i hope i you.

3

step-by-step explanation:

because where the point where the 2 lines intersect is (3,-1) the x value is 3