Please help me! I’ve been doing this for 5 hours on my own and not getting no progress! Please help me and try to anwser correctly! I don’t want what happened yesterday to happen again please!

$18

Step-by-step explanation:

For an approximation, we can start by rounding the number. In this case, you're probably expected to round to the nearest 1. 90.32 rounds down because 3 is less than 5. This leaves us with 90.

A good way to approximate this is to figure out what 10% is. You can do this by sliding the decimal over one place value.

10% of 90 is 9

10% + 10% = 20%

So we can add our two 10%'s together to find 20%

9 + 9 = 18

$18 is the tip

(I checked our work with the actual numbers and it checks out as a good approximation)

90.32 x .2 = 18.06