Studying a group of children from first grade through high school to see the effect of pre-schooling on educational success would be which type of study?
a
longitudinal
cross-sectional
Ос
natural observation
Od
experimental

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

The circle below is centered at the point (3, 1) and has a radius of length 2. what is the equation?

X^2/100+y^2/25=1 the y-intercepts are at: a) (-10,0) and (10,0) b) (0,10) and (0,5) c) (0,-5) and (0,5)