The iris is the colored part of your eye. what is the main function of your iris?
a) muscles in the iris direct light waves to the back of our eyes.
b) muscles in the iris trigger a response that protect our eyes.
c) muscles in the iris control the amount of light that enters the eye.
d) the iris is responsible for refracting light to focus the images we see

Which of the following is correct interpretation of the expression -4+13

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap