39/40 as a decimal is 0.975
Answer:

or

Step-by-step explanation:
we know that
Applying the Pythagorean Theorem in the rectangular pool

where
d is the diagonal of the pool
L is the length of the pool
W is the wide of the pool
we have

substitute the given values

solve for L

simplify

or

Answer:
A. -5
Step-by-step explanation:
-9 + 4 = -5
hope this helps
the last option is correct
7,5
these two are the ones for prime numbers between 7 and 35