The graph shows the number of states and Washington DC, within each range of electoral votes for the 2020 presidential election Electoral Votes by State , 2020 Which interval contains 11 states ? Check all that apply 3 3 to 6 6 to 9 to 12 12 to 15 16 14 12 10 Number of States 18 to 21 6 18 21 9 12 15 Electoral Votes

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

ur mom

step-by-step explanation:

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,