Hailey has a toy car collection of 300 toy cars. She keeps 30% of the toy cars on her wall. How many toy cars does she keep on her wall?

90

Step-by-step explanation:

300x30%

30% is the same as 0.30

so

300x0.30

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,