Answer:
The solutions are
and 
Step-by-step explanation:
we have

Divide by
both sides
------> 
we know that
The formula to solve a quadratic equation of the form
is equal to

in this problem we have

so

substitute






Answer:
1 and 7 are congruent
2 and 5 are supplementary
4 and 6 are congruent
3 and 8 are supplementary
Answer:
13
Step-by-step explanation:
a^2 + b^2 = c^2
11^2 + 7 ^2 = c^2
121 + 49 = 170
√170 = 13.04
Answer:
1/3
Step-by-step explanation:
The reciprocal of a number is 1 divided by the number.
The reciprocal of 3 is 1 divided by 3, or simply 1/3.
It would be 12 because you have to solve for the percent