Answer:

Step-by-step explanation:
The multiplicative inverse of a number n is
, then
inverse of
is
= 
One t-shirt = $19
Number of t-shirts = $57 ÷ $19 = 3
Answer: 3 t-shirts
Based on the distance formula, the distance between points (3, 7) and (x1, y) is:
. SO, it is TRUE.
<h3>What is the Distance Formula?</h3>
The distance formula which can be applied to find the distance between two coordinate points is:
.
Given the points:
(x1, y1)
(3, 7) = (x2, y2)
Substitute

Therefore, the statement that says the distance between points (3, 7) and (x1, y) =
, is TRUE.
Learn more about the distance formula on:
brainly.com/question/661229
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First you open up the brackets so the sign for 2d changes to positive. So it will look like 3d-9+2d=51 then u simply the 3d-9+2d that should give 5d-9=51. Then you add 9 to both sides of the expression 5d-9+9=51+9. That will be 5d =60 so you divide 5 on both sides to find the value of 1 d which is 60/5=12 then to find 3d you multiply the value of d by three so it's 12(3)=36
The answer would be that Mario finished his homework at 3:55