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3 years ago

(a-2b)3 when a=-2 and b= -1/2

Mathematics

1 answer:

Aleks [24]3 years ago

6 0

Answer: (a-2b)3=3a-6b

=3x-2-6x-1/2

= -6+3

= -3

Step-by-step explanation:

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Vertex (0,0) focus (0,-1) A) y=1/4 x^2 B) y=-1/4x^2 C) y=1/16x^2 D) y=-1/16x^2

hichkok12 [17]

Answer:B

Step-by-step explanation:

8 0

2 years ago

What is the solution of the system? Use any method. 3x + 2y = 7 y = –3x + 11

Gnom [1K]

Answer:

$(5,-4)$

Step-by-step explanation:

SOLVE BY SUBSTITUTION:

STEP 1: Replace all occurrences of $y$ with $-3x+11$ in each equation.

$-3x+22=7\\y=-3x+11$

STEP 2: Solve for $x$ in the first equation.

$x=5\\y=-3x+11$

STEP 3: Replace all occurrences of $x$ with $5$ in each equation.

$y=-4\\x=5$

6 0

2 years ago

Find the total surface area of the following cone. Leave your answer in terms of pi.

kramer

Answer:

90π cm²

Step-by-step explanation:

Given: Radius of circular base= 5 cm

height= 12 cm

Now finding the surface of cone.

Formula; Surface area of cone= $\pi rl+ B$

Where; r= radius

l= slant height

B is the area of base, which is circle.

Area of circle (B)= πr²

Area of circle (B)= $\pi \times 5^{2} = 25\pi$

∴ Area of circle (B)= $25\pi$

Finding slant height (l)

Formula; $l= \sqrt{r^{2}+h^{2} }$

⇒l = $\sqrt{5^{2}+12^{2} } = \sqrt{25+144 }$

∴ l= $\sqrt{169} = 13\ cm$

Next, using the formula for finding surface area of cone.

Surface area of cone= $5\times 13\times \pi + 25\pi$

⇒ Surface area of cone= $65\pi +25\pi = 90\pi$

∴ Surface area of cone= 90π cm²

6 0

3 years ago

Translate this sentence into an equation.

gavmur [86]

Answer:

3c = 33

Step-by-step explanation:

6 0

3 years ago

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HELP PLSS

avanturin [10]

(4,20) is the only solution that works being that ur inequalities contain no equal signs.

5 0

3 years ago

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