You add 5x to 2x+2, 7x+2. Set this equation equal to 80, 7x+2=80 solve and you will get 11.1428571429. Round this number to 11, 11.1, or 11.14.
Answer:
Brett can put
= 0.625 pounds in each bird cage.
Step-by-step explanation:
The total amount of bird seed left =
pounds
=
pounds
Number of birds in pet shop = 4
So, the share of each bird = 
= 
Hence, Brett can put
= 0.625 pounds in each bird cage.
The vertex is (-1,0). you can find this after putting the equation in standard form by completing the square.
See the picture attached to better understand the problem
we know that
in the right triangle ABC
cos A=AC/AB
cos A=1/3
so
1/3=AC/AB----->AB=3*AC-----> square----> AB²=9*AC²----> equation 1
applying the Pythagoras Theorem
BC²+AC²=AB²-----> 2²+AC²=AB²---> 4+AC²=AB²----> equation 2
substitute equation 1 in equation 2
4+AC²=9*AC²----> 8*AC²=4----> AC²=1/2----> AC=√2/2
so
AB²=9*AC²----> AB²=9*(√2/2)²----> AB=(3√2)/2
the answer isthe hypotenuse is (3√2)/2