Arectangular pyramid is sliced so the cross section is perpendicular to its base and passes through its vertex.
what is the shape of the cross section?
a: square
b: trapezoid
c: triangle
d: rectangle

Anyone know? will mark brainliest if correct!

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!