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3 years ago

Find the value of the expression 12x /2y + xy, when x = 2 and y = 4.

Mathematics

1 answer:

Elza [17]3 years ago

5 0

Answer:

Easy imma just add random letters but here is your answer jfvnjsamdjvnjnpiesr;jknjlnaviciherklnnfvjln erkjnkjnckjawenrjgnkjev

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A ball is thrown from an initial height of 1 meter with an initial upward velocity of 11 m/s. The ball's height h (in meters) af

bonufazy [111]

Answer:

$t=0.64$ and $t=1.56$ seconds

Step-by-step explanation:

$h=1+11t-5t^2\\\\6=1+11t-5t^2\\\\0=-5+11t-5t^2\\\\0=-5t^2+11t-5\\\\t=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\\ \\t=\frac{-11\pm\sqrt{11^2-4(-5)(-5)}}{2(-5)}\\\\t=\frac{-11\pm\sqrt{121-100}}{-10}\\ \\t=\frac{-11\pm\sqrt{21}}{-10}\\\\t=\frac{11}{10}\pm\frac{\sqrt{21}}{10}\\ \\t_1\approx0.64\\\\t_2\approx1.56$

Therefore, the values of t for which the ball's height is 6 meters is $t=0.64$ and $t=1.56$ seconds.

4 0

2 years ago

Daisy cut a square out of a sheet of graph paper. The square had an area of 16 square cm. She then trimmed 1 cm from each side o

Degger [83]

Answer: 4 cm^2, it went from 4x4 to 2x2.. clipped on all sides...

Hope I helped!

Giving me brainliest is much appreciated! :).

7 0

3 years ago

A driver is 15 feet below the surface of the water 10 seconds after he entered the water and 90 feet below the surface after 40

spin [16.1K]

Answer:

$\frac{-75ft}{30sec}$ or simplified would be $\frac{-2.5ft}{sec}$

Step-by-step explanation:

In order to calculate the rate of change, we must subtract his end position and end time by the starting position and starting time. We are using the -15 feet since it is below the surface area as the starting position and the 10 seconds as the starting time. We make each of these into a fraction and subtract like so...

$\frac{-90ft - (-15ft)}{40sec - 10sec} =$ rate of change

$\frac{-75ft}{30sec} =$ rate of change

$\frac{-2.5ft}{sec}$ = rate of change

Therefore, we can see that the rate of change of the diver is $\frac{-75ft}{30sec}$ or simplified would be $\frac{-2.5ft}{sec}$

6 0

3 years ago

Which of the following functions is graphed below

Lady_Fox [76]

B. The quadratic is x < 3and the linear is x > or = 3

4 0

2 years ago

As of mid-2016, the world's population was about 7.4 billion people. The population of Country A was 226 million. In mid-2016, w

kherson [118]

Answer:

The percentage of country A population to the world population

= 3.05%

Step-by-step explanation:

Country A population as of 2016

= 226 million

= 226000000

The world population as of 2016

= 7.4 billion

= 7400000000

The percentage of country A population to the world population

= Country A population /The world population

The percentage of country A population to the world population

= 226000000/7400000000

The percentage of country A population to the world population

= 0.03054

Now multiplying by 100

= 3.05%

3 0

3 years ago