Answer: Ana will hit the water after 3 seconds.
Step-by-step explanation:
The exercise gives you the following function which models Anna's height above the water (in meters) after diving "x" seconds:
You can rewrite the function with 
:
In order to calculate the number of seconds Ana will hit the water after diving, the procedure is:
- Substitute 
into the function:
- Solve for "x".
By the Zero Product Property, you know that if 
, then 
or 
.
Then you get:
- Choose the positive value (
)
Then, Ana will hit the water after 3 seconds.
Step-by-step explanation:
what do we need to do ?
just calculate the value of the expression with these values for the variables ?
what's the problem ? this is basic calculating :
-6/2 - 4 + 9×4 = -3 - 4 + 36 = 29
remember (please, for your life !) that multiplication and division always have to be calculated before additions and subtractions (except when brackets force is to go a different route).
Answer:
The area of the circle is 1256cm squared
Step-by-step explanation:
3.14(20 x 20)
3.14(400)
A : 1256cm squared
The surface area is 24 mm
