Tony is 8 years old. His sister Anna is 4 years less than twice his age. Write a numerical expression for Anna’s age.

Anna:2(8)-4

tony=8

anna=2(8)-4

twice of tony's age is 2(8), and it also said 4 years less than.

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,

10 b/c 5*2 =10

step-by-step explanation: