The height of an object off the ground, h (in feet) t seconds after it is launched into the air is given by
h(t) = −16t2 + 128t, 0 ≤ t ≤ 8.
Find the average rate of change of h over the interval
[4, 8].

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

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