How to do the vertex is using the formula -b/2a
your a=-9 and b is -18 but it going to become +18 because you are multiplying the -(-18) which there a 1 in front the neg. you going to multiply the -9 by 2 and do 18/18 so your x= -1. You got your x, you going to put in the equation as y=-9(-1)^2-18(-1)-1 then you got your y... hope this is helpful :)
The time that the ball is in the air is 2x the time that it takes to reach the maximum value.
In order to find the time at the max value you use the equation -b/2a where b is the value attached to the t and a is the value attached to t^2.
therefore, the time at the max value is -180/(2)(-16)=5.625 seconds
Total time= (5.625)(2)=11.25
Answer:
<h3>
</h3>
Step-by-step explanation:
Given,
diameter ( d ) = 12 in
height ( h ) = 15 in
<u>finding </u><u>the </u><u>radius </u><u>of </u><u>a </u><u>cylinder</u>
Radius is just half of diameter.
Radius ( r ) = 12 / 2 = 6 in
<u>finding </u><u>the </u><u>volume </u><u>of </u><u>a </u><u>cylinder </u><u>having </u><u>radius </u><u>of </u><u>6</u><u> </u><u>in </u><u>and </u><u>height </u><u>of </u><u>1</u><u>5</u><u> </u><u>in</u>
Volume of a cylinder = <u>
</u>
⇒
⇒
⇒<u>
</u>
Hope I helped!
Best regards!!
Answer:
Step-by-step explanation:
So for this one you need to find how much text messeages you make in a day and subtract it from 19.
The second one confused me though.
