What value of b will make the system y = 3x + 9 and y = 2.5x + b intersect at the point (4, 21)?

15 points what is the end behavior of this graph? & what is the asymptote of this graph?

Which number line correctly shows 0.8 + 0.3?

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