Answer:
The missing number is 21
Step-by-step explanation:
-12 + x = 9
x = 9 + 12
x = 21
162.50-35.00=127.50
127.50/12=10.63
10.63 feet of guttering were required
using the Pythagorean Thereom:
3^2 +4^2 = X^2
9 +16 = 25
x^2 = 25
X = sqrt (25)
x = 5
it would be 5 miles
I would say the answer would be 29.17% because
=29.17%
Hope this helps
I'm so sorry if this is wrong
have a great day/night
Supposse that the distance from the point
to the point
is equal to the distance from
to the point
. Then, by the formula of the distnace we must have

cancel the square root and the
's, and then expand the parenthesis to obtain

then, simplifying we obtain

therfore we must have

this means that the points satisfying the propertie must have first component equal to 5. So we can give a lot of examples of such points:
. The set of this points give us a straight line and the points (3,0) and (7,0) are symmetric with respect to this line.