Answer:
90t-21t=69t
Step-by-step explanation:
4:00pm to 6:00 am is 14 hours. 14 x 1.5 is in fact 21 which means the temperature dropped 21 degrees in those 14 hours.
Answer:
Step-by-step explanation:




Answer:
zero
Step-by-step explanation:
1/2 feet is less than 3/4 feet, so is insufficient length for even one propeller. No propellers can be cut from the board.
Answer:
544 feet.
Step-by-step explanation:
|504| +|-40|=544
Check the picture below
the triangles are similar, the angles are congruents then
so... just add them up, and divide by 2, or set them as rational