: (2x - 4) - (6x + 6)

-4x - 10

Step-by-step explanation:

Step 1:  Distribute the minus

2x - 4 + (-6x) + (-6)

2x - 4 - 6x - 6

Step 2:  Combine like terms

2x - 6x - 4 - 6

-4x - 10

 -4x - 10

answer:

a

step-by-step explanation:

we require to find ac using pythagoras' identity

the square on the hypotenuse is equal to the sum of the squares on the other 2 sides, thus

ac² + 12² = 40²

ac² + 144 = 1600 ( subtract 144 from both sides )

ac² = 1456 ( take the square root of both sides )

ac = = = 4

tan a = = =

= × = → a