To start out, you can use the 50 degrees. on the opposite side, which is 2, it would also be 50 degrees because they are equal.
to find 1 and 3, you need to remember that a line equals 180 degrees. You can do 180-50 which equals 130 degrees. That is the answer to number 1. It is the exact same for 3.
I can't see the instructions, so I assume you're solving for the variable to the right.
(a)
A = pi*r(l+L), first divide both sides pi*r
A/(pi*r) = l + L, next subtract l from both sides
L = A/(pi*r) - l
(b)
V = pi*r^2*h, first isolate the variable r by dividing both sides by pi*h
V/(pi*h) = r^2, next take the inverse operation of square, which is the square root
r = sqrt root [ V/(pi*h)], assume r is a positive number only, so you do not need to consider the - square root option
(d)
t = 2*pi*sqrt (L/g), first divide both sides by 2*pi to isolate the radical
t/(2*pi) = sqrt (L/g), next square both sides to remove the radical sign over L
[t/(2*pi)]^2 = L/g, last multiply both sides by g
L = g*[t/(2*pi)]^2
(e) (actually it should say KE for kinetic energy)
E = (1/2)mv^2, multiply both sides by 2 and divide both sides by m
2*E/m = v^2, next take the inverse operation of square, square root of both sides
v = sqrt [2*E/m], again assume v is a positive quantity, although velocity is a vector quantity and should indicate both magnitude and direction
Hey!
You have to find 80% of 70. First change 80% to a decimal and multiply by 70.
To change percents to decimals, remove the % sign and move the decimal point 2 places to the left.
Now multiply
<em>The restaurant sold 56 salmon fillets.</em>
Good luck and hope this helps! :)