Answer:
+7
Step-by-step explanation:
if you go from 28 to 21 you see there is a difference of 7 and sense the number is a smaller number now we know the dolphin went up more towards the surface there for there is a change of positive 7
28-21=7
Answer:
<em>Correct choice: B</em>
Step-by-step explanation:
<u>Equation Solving</u>
The area of a trapezoid with height h and bases b1 and b2 is given by:

We must solve this formula for h.
First, multiply by 2 to eliminate denominators:

Now, divide by b1+b2:

Swapping sides:

Correct choice: B
Answer:

Step-by-step explanation:
-A hemisphere is equivalent to half of a sphere.
- The area of a sphere is given by the formula:

-Given that r=3.6m, the hemisphere's volume can be calculated as:

Hence, the hemisphere's volume is approximately 
Answer:
i normally know these but i honestly dont know but can you please put branliest
Step-by-step explanation: