If an item that originally cost $19 is increased to $21, what is the percentage of increase in the item?

  10.53%

Step-by-step explanation:

Percentage change can be found using the formula ...

  percent change = ((new value) - (old value))/(old value) × 100%

For your numbers, this is ...

  percent change = (($21 -$19)/$19) × 100% = 2/19×100% ≈ 10.53%

The increase is about 10.53%.

x= -3

step-by-step explanation:

step 1: simplify brackets

4 - x - 1 = 6

step 2: simpilfy

3 - x = 6

step 3: subtract 3 from both sides

-x = 6 - 3

step 4: simpilfy 6 - 3

-x = 3

step 5: multiply both sides by -1

x = -3

answer: i'm not going to give you the answer, but some hints to work it out.

step-by-step explanation: so, if there is a straight line that means that the line angle is 180°. so we subtract the 2 angle measures provided, (15 and 38) from 180. so the answer is 180 - (38 + 15). (you have to solve the equation)