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3 years ago

I keep getting stuck does anyone know the solution? x=y+4 2x+2y=16

Mathematics

1 answer:

mixas84 [53]3 years ago

5 0

Answer:

Y = 2

X = 6

Step-by-step explanation:

Hope this helps. Pls give brainliest.

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SOMEONE HELP ME PLEASE

WINSTONCH [101]

Answer:

Fraction: 50/100

Percentage: 50%

Step-by-step explanation:

Find the total amount of marbles:

30+50+20=100

Number of blue marbles: 50

Fraction: 50/100

Percentage: 50%

7 0

3 years ago

A 5kg bag of peas cost $17.91 at the same rate what would a 9kg bag of peas cost

iren2701 [21]

Answer:

17.91÷5=3.582

then

3.582×9=32.238

or 32.2 or just 32

Step-by-step explanation:

when you see something like this all you have to do is divide the two number then with that number just multiply.

8 0

3 years ago

6x+7=8x17 prove x=12

Sophie [7]

6x + 7 = 8x - 17
6x- 8x = -17 - 7
-2x = -24 • divide both sides by -2
Thefore x = 12

7 0

3 years ago

Here we will study the function f (x) = e ^ x sin (x), where x ∈ [0, 2π]. a) Determine where the function is decreasing and incr

Semmy [17]

fff

$f(x) = e^x sin (x)$

To find increasing and decreasing intervals we take derivative

$f'(x) = e^xsin(x)+e^x(cosx)= e^x(sinx+cosx)$

Now we set the derivative =0 and solve for x

$e^x(sinx+cosx)=0$

sinx + cosx =0

divide whole equation by cos x

$\frac{sinx}{cosx} + \frac{cosx}{cosx} =0$

tanx +1 =0

tanx = 1

$x=\frac{3\pi }{4}$ and $x=\frac{7\pi}{4}$

Now we pick a number between 0 to $\frac{3\pi }{4}$

Lets pick $\frac{\pi }{2}$

Plug it into the derivative

$f'(x) =e^{\frac{\pi }{2}}(sin(\frac{\pi}{2})+cos(\frac{\pi }{2}))$

= 4.810 is positive

So the graph of f(x) is increasing on the interval [0, $x=\frac{3\pi }{4}$ )

Now we pick a number between $\frac{7\pi}{4}$ to 2pi

Lets pick $\frac{11\pi}{6}$

Plug it into the derivative

$f'(x) =e^{\frac{11\pi}{6}}(sin(\frac{11\pi}{6})+cos(\frac{11\pi }{6}))$

= 116 is positive

So the graph of f(x) is increasing on the interval $(\frac{7\pi }{4}, 2\pi)$

Increasing interval is $(0,\frac{3\pi }{4}) U (\frac{7\pi }{4}, 2\pi)$

Decreasing interval is $(\frac{3\pi}{4}, \frac{7\pi}{4})$

(b)

The graph of f(x) increases and reaches a local maximum at $x=\frac{3\pi}{4}$

The graph of f(x) decreases and reaches a local minimum at $x=\frac{7\pi}{4}$

(c)

f(0) = 0

$f(2\pi)=0$

$f(\frac{3\pi }{4})=7.46$

$f(\frac{7\pi}{4})=-172.64$

Here global maximum at $x=\frac{3\pi}{4}$

Here global minimum at $x=\frac{7\pi}{4}$

3 0

4 years ago

Read 2 more answers

The ratio of boys to girls in the Grade 3 classes at Domino Primary school

olga_2 [115]

Answer:

28 learners

Step-by-step explanation:

Boys : Girls

3 : 4

Since there are 12 boys and 3 units of them...

3 units = 12

1 unit = 12 ÷ 3 = 4

Girls =

4 units = 4 x 4 = 16

Total number of girls and boys: 12 + 16 = 28

7 0

3 years ago