Mercy drops a penny into a pond. The penny drops 1.5 inches every second.
How many inches below the surface will it be after 8 seconds? write the problem then evaluate.
Problem: Mercy drops a penny into a pond. The penny drops 1.5 inches every second. How many inches below the surface will it be after 8 seconds?
Evaluation:
The penny drops 1.5 inches every second, so after 8 seconds it will have dropped:
1.5 inches x 8 seconds = 12 inches
Therefore, after 8 seconds the penny will be 12 inches below the surface.
An environmental scientist is measuring changes in the water level of a local stream this table shows the changes she recorded during the last few months
May: 5
June: -3
July: 3.5
August: 1.5
During which month did the water decrease?
The water level of the stream decreased during the month of June, where it recorded a change of -3.
Between which months did the water level change the most?
We can calculate the absolute values of the changes in water level for each month by taking the magnitude of each change. The absolute values of the changes are:
May: 5
June: |-3| = 3
July: 3.5
August: 1.5
The month with the highest absolute change is May, with a change of 5 inches in water level.
So, the water level changed the most between April and May.
The scientist recorded the change in water level in September, and that value was 5 times the amount of August. What is the value for September?
We can use the information given to find the value for September:
If the change in water level for September was 5 times the amount of August, and August had a change of 1.5 units, then we can multiply 1.5 by 5 to find the change for September:
September change = 1.5 x 5 = 7.5
Therefore, the change in water level for September was 7.5 units.
The temperature at 2:00 pm is 27 degrees. At 2:am the temperature has fallen to -4 degrees. What is the difference in temperature from 2:00 pm to 2:am?
A. 27 + (-4)
B. 27 ÷ (-4)
C. 27 - (-4)
Choose the correct problem.