-16t^2+400=0
16t^2=400
take square root on both sides.

4t=20
t=20/4
t=5
Mainly extinction and or viruses
You use the equation a^2 + b^2 = c^2 and the parts include the hypotenuse which is across from the right angle(the diagonal part of the triangle) and this is also the c for the equation and the a and b are the two legs(the other lengths of the triangle) and to find one of these you plug what you know into the equation and go from there
Answer:
Step-by-step explanation:
Easy, just make 2 thingummies cancle each other
like this
(2x+3) and (-2x+4)
the sum is 7 because x's cancel
or
(2x-3) and (4x+3),
the sum is 6x because -3 an 3 cancel