(easy)+(20 points) insert parenthesis in expression 2 so that it has a value of 19. then show why your expression has a value of 19. i've already done the work: (5+4)*2+6-2*2-1=19 (i added the parenthesis) but i dont know how to show why it makes 19 so yeah could someone put an explanation or something

The reasoning behind why it equals 19 is because you use PEMDAS (aka: Order Of Operations). When you solve, you solve in the same order PEMDAS, so you first solve the parenthesis. Next, you'd solve exponents, but in this case, there are none. So, you solve the multiplication and/or division (from left to right). Finally you'd solve completely, by adding and subtracting (from left to right). Doing all these steps would give you your answer of 19.

I hope this helps!

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490