What is the degree of the polynomial (5x^3+4x^2)-(6x^2-2x-9) ??? pls help worth 20 pts.

Step-by-step explanation:

2a+1b=27.50
4a+2b=59.50
Multiply first equation by -4 and the second by 2 so you can drop off the a values then add the equations together.  Then solve for b.  You should get b=6.

Then plug b into one of the original equations and solve for a and you should get 10.75

So a plate of spaghetti is $10.75 and a salad is $6.