Answer:
Step-by-step explanation:
Sight.
Answer:
B
Step-by-step explanation:
Pythagorean theorem (applicable on right triangles only) says:

- Where
and
are the two legs of the triangle and
is the length of the hypotenuse [THE LONGEST SIDE].
<u>We can square each leg on the triangle and take the sum, if that is equal to the square of the longest side, we have a right triangle. Let's check for all of these.</u>
A.


They're not right triangle.
B.


This is a right triangle.
C.


They're not right triangle.
D.


They're not right triangle.
Only B is the right triangle.
Answer: s + 30 ≥ 50; s ≥ 20
Step-by-step explanation:
let s be the amount you have yet to spend in order to reach $50 or more
you already have $30.
This means you need to spend at least $20 more ($50 - $30 = $20)
S can be greater than or equal to $20 because your total will be 50 or more, therefore qualifying for the discount.