Answer:
2
Step-by-step explanation:
12.80=6.4x
12.8/6.4=2
x=2
Answer:
5 friends.
Step-by-step explanation:
Let x be the number of friends,
Since, each had 2/5 of a bag of peanuts left over,
Thus, the total numbers of bag left = 2/5 of the number of friends,

According to the question,


Hence, there were 5 friends.

is the formula for calculating x1 and x2
To prove x1 + x2 = -b/a all we need to do is to express x1 and x2 from equation above
once we do we will get -2b/2a which is equal to -b/a because square root part will negate each other. one has + sign in front and other - sign
Showing that x1x2 = c/a goes similar way.
the numerator parts is actually difference of squares. after that we will have:
-b^2 -b^2 + 4ac = 4ac
in denominator we have 2a*2a = 4a^2
4ac/4aa = c/a
Answer:
x = 4
Step-by-step explanation:
Using the sine ratio in the right triangle and the exact value
sin45° =
, then using the upper 45°
sin45° =
=
=
( cross- multiply )
x = 4