3 years ago

Can I get help on this I need it MAJOR! WILL MARK BRAINLIEST!

Mathematics

1 answer:

RideAnS [48]3 years ago

8 0

Answer:

Step-by-step explanation:

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Answer:

A. Angle A=80°

Angle I= 30°

B.y=6.39

x=9.43

Step-by-step explanation:

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3 years ago

X+4=2x How do you solve it.

earnstyle [38]

Subtract the x on the left from the 2x on the right side

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3 years ago

Sally needs 6 gallons of water, but she only has a 2 quart pitcher. how many times does she need to fill it up to make 6 gallons

mojhsa [17]

2 quart pitcher times 2 trips to get 1 gallons of water. Multiply that by 6.

12 trips in total

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4 years ago

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A level maths factor theorem help in part (b) please

Rina8888 [55]

Given polynomial $f(x)=4 x^{3}-12 x^{2}+2 x-6$ .

(a) To show that (x – 3) is a factor of f(x).

Factor theorem:

A polynomial f(x) has a factor of (x – a), if and only if f(a) = 0.

$f(x)=4 x^{3}-12 x^{2}+2 x-6$

$f(3)=4 (3)^{3}-12 (3)^{2}+2 (3)-6$

$=4(27)-12(9)+6-6$

$=108-108$

= 0

f(3) = 0

Hence (x – 3) is a factor of f(x).

(b) $f(x)=0$

$4 x^{3}-12 x^{2}+2 x-6=0$

Here $4x^2$ is common in first 2 terms and 2 is common in next 2 terms.

$4x^2(x-3 )+2 (x-3)=0$

Now, (x – 3) is common in both terms.

$(x-3)(4x^2+2)=0$

$(x-3)=0$ and $(4x^2+2)=0$

x = 3 and $4x^2+2=0$

3 is the real root.

using quadratic formula solve $4x^2+2=0$ and find the other roots.

$$x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}$

$$x=\frac{-0 \pm \sqrt{0^{2}-4 (4) (2)}}{2 (4)}$

$$x=\pm\frac{\sqrt{-32}}{8}$

$$x=\pm\frac{4\sqrt{2}i}{8}$

$$x=\pm\frac{\sqrt{2}i}{2}$

These are complex roots.

Hence 3 is the only real root of the equation f(x) = 0.

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4 years ago

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Ou are mailing a package that weighs 5 pounds, and sending it first class. The post office charges $0.44 for the first ounce, an

Inga [223]

5 pounds= 80 ounces
total cost= ($0.44×1)+($0.20×79)=$16.24

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4 years ago