Evaluating expressions

10

Step-by-step explanation:

2/5 ( a+2b)^2

Let a =3 and b = -4

2/5 ( 3+2*-4)^2

Parentheses first

2/5 ( 3 -8)^2

2/5 ( -5)^2

Then exponents

2/5 ( 25)

Multiply

10

10

Step-by-step explanation:

● (2/5) ( a + 2b)^2

a = 3 and b = -4

● (2/5) ( 3 + 2(-4))^2

● (2/5) ( (3 - 8 )^2

● (2/5) (-5)^2

● (2/5) 25

● 10

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.

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,