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2 years ago

Helppp meeeeeeeeeeeeeeee

Mathematics

1 answer:

postnew [5]2 years ago

7 0

Answer:

Area = 168m^2

Step-by-step explanation:

Area of triangle = 1/2×base×height

Area = 1/2bh

= 1/2(8+16)(14)

= 168m^2

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What is the perimeter of a 12 cm and 4cm

salantis [7]

Answer:

what is the perimeter of a 12 cm and 4cm is16cm

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3 years ago

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3 to the power 2x+3 is subtracted by 9 which is equal to 2 times 9 to the power x+1 and is subtrcted by 6

hichkok12 [17]

Answer:

x = -0.5

Step-by-step explanation:

Here we have the sentence:

"3 to the power 2x+3 is subtracted by 9 which is equal to 2 times 9 to the power x+1 and is subtracted by 6"

The first part:

"3 to the power 2x+3 is subtracted by 9..."

This can be written as:

$3^{2x + 3} - 9$

"... is equal to 2 times 9 to the power x+1 and is subtracted by 6"

$3^{2x + 3} - 9 = 2*9^{x + 1} - 6$

Let's solve this for x.

First, we can add 9 in both sides:

$3^{2x + 3} = 2*9^{x + 1} - 6 + 9 = 2*9^{x + 1} + 3$

We also know the relations:

$a^n*a^b = a^{n + b}$

and

$(a^n)^m = a^{n*m}$

We can write the left part as:

$3^{2x + 3} = 3^{2x}*3^3 = (3^2)^x*3^3 = 9^x*27$

And the right side as:

$2*9^{x + 1} + 3 = 2*9^x*9 + 3 = 18*9^x + 3$

Then the equation becomes:

$27*9^x = 18*9^x + 3$

Now let's move both terms with 9^x to the left side:

$27*9^x - 18*9^x = 3\\$

$(27 - 18)*9^x = 3$

$9*9^x = 3$

$9^x = 3/9 = 1/3$

Now remember that:

Ln(a^b) = b*Ln(a)

Then if we apply the Ln( ) function to both sides, we get:

$Ln(9^x) = Ln(1/3)$

$x*Ln(9) = Ln(1/3)$

$x = \frac{Ln(1/3)}{Ln(9)} = -0.5$

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3 years ago

A cube with edges of length x centimeters has volume v(x)=x^3 at the instant when x=2, what is the rate of change of x, in centi

Margarita [4]

Dv/dt=40 dv/dt=3x^2dx/dt
40=3x^2dx/dt
40=12dx/dt
10/3=dx/dt

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2 years ago

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dangina [55]

Find the greatest common multiple. Could you try to list them out?

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3 years ago

Please take a look at the picture. Please write your answer with an explanation.

34kurt

Answer: 13

Since you are given x and y fill in the numbers corresponding to the letters in the equation.
-8(5)+12-17(-3)-2(5)
-40+12+51-10
13

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2 years ago