Janice is dividing 1.92 divided by 6. why does she exchange the place value blocks shown for 18 tenths and 12 ones ?

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2