3 years ago

Part2: which quadrant?

Mathematics

2 answers:

natka813 [3]3 years ago

8 0

Answer:

Step-by-step explanation:

Burka [1]3 years ago

5 0

yes what you have marked is correct

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A ball is thrown from an initial height of 2 meters with an initial upward velocity of 9/ms . The ball's height h (in meters) af

Alecsey [184]

A ball is thrown from an initial height of 2 meters with an initial upward velocity of 9/ms

Balls height $h= 2 +9t -5t^2$

To find all values of t for which the ball's height is 3 meters

We plug in 3 for h and solve for t

$h= 2 +9t -5t^2$

$3 = 2 +9t -5t^2$

Solve for t

$0= -1+ 9t -5t^2$

$5t^2 - 9t + 1 = 0$

Solve using quadratic formula

$t= \frac{-b+- \sqrt{b^2-4ac} }{2a}$

$t= \frac{9+- \sqrt{(-9)^2-4*5*1} }{2*5}$

After simplifying this,

$t= \frac{9+\sqrt{61}}{10}$ = 0.11898

$t= \frac{9-\sqrt{61}}{10}$ = 1.68102

the values of t for which the ball's height is 3 meters= 0.12 sec , 1.68 sec

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3 years ago

The total surface area of a hemisphere is 300cm2. What is the surface area of the sphere having equal radius to the hemisphere.

raketka [301]

Answer:

400cm²

Step-by-step explanation:

the surface area of the sphere =

4/3 x The total surface area of a hemisphere

=> 4/3 x 300 = 400cm²

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2 years ago

in an 7th grade class with 80 people, seven tenths of the students wore shorts, how many students wore shorts

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Answer:

Step-by-step explanation:

80 x (7 / 10) = 56

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In a survey 37% of people chose salads over a meat dish in all 81 people chose salads how many people were in the survey

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Looks like the answer would be 219 people since you can't have half a person.

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Step-by-step explanation:

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