An elevator starts on the 100th floor of an building it descends 4 floors ever 10 seconds at what floor will the elevator be 60 seconds after it starts

The elevator will be at the 76th floor after 60 seconds.

Step-by-step explanation:

In this question, the rate given is 4 floors every 10 seconds.  This can be written as:

=

So, the elevator descends at a rate of 1 floor every 2.5 seconds.  We can find the number of floors descended after 60 seconds by dividing:  60/2.5 = 24 floors.  Since the elevator is starting at the 100th floor, we would subtract 100 - 24 = 74, or the 74th floor that the elevator would be at after 60 seconds.  

assuming you mean addition: addition and subtraction are reverse operations.

step-by-step explanation:

answer: i'm not going to give you the answer, but some hints to work it out.

step-by-step explanation: so, if there is a straight line that means that the line angle is 180°. so we subtract the 2 angle measures provided, (15 and 38) from 180. so the answer is 180 - (38 + 15). (you have to solve the equation)