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2 years ago

Week 12 Please answer with clear instructions so that i can apply this to other questions

Mathematics

1 answer:

OLEGan [10]2 years ago

3 0

Answer:

$94.2m^2$

Step-by-step explanation:

The formula for SA of a cone is...

$\pi (r)(h)+\pi (r)^2$

Fill in what you have

$\pi (3)(7)+\pi (3)^2$

Pi is 3.14 for our purposes

$\pi (3)(7)+\pi (3)^2\\3.14(3)(7)+3.14(3)^2$

Then solve

$21(3.14)+9(3.14)\\\\94.2m^2$

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katovenus [111]

Answer:

x = $\frac{7+\sqrt{47}\times i }{4}$

Step-by-step explanation:

<u>To solve quadratic systems,we always substitute one variable in terms if the other and then solve the equation.</u>

x + 2y = 6 ---------------(1)

y - 5 = $(x-2)^{2}$ ---------------(2)

y = $(x-2)^{2}$ + 5 ---------------(3)

Substitute (3) in (1) ,

x + 2( $(x-2)^{2}$ + 5 ) = 6

$(a + b)^{2}$ = $a^{2} + 2ab + b^{2}$

x + 2( $x^{2} - 4x + 4$ + 5 ) = 6

$2x^{2} - 7x + 12=0$ --------------(4)

The roots of the quadratic equation $ax^{2} +bx+c$ is

x = $\frac{(-b) + \sqrt{(-b)^{2}-4 \times ac } }{2 \times a}$ -----------(5)

According to equation (5),solution of (4) is

x = $\frac{7 + \sqrt{(-7)^{2}-4 \times 24 } }{2 \times 2}$

x = $\frac{7+\sqrt{49-96}}{4}$

x = $\frac{7+\sqrt{47}\times i }{4}$

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Step-by-step explanation:

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