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wariber [46]
3 years ago
13

Need help asap!!

Mathematics
1 answer:
In-s [12.5K]3 years ago
8 0

Answer:D

Step-by-step explanation:

(3x^3 - 5x^2 + 4x - 9)-(7x^3 - 8x^2 - 5x + 10)

open brackets

3x^3 - 5x^2 + 4x - 9 - 7x^3 + 8x^2 +5x - 10

Collect like terms

3x^3-7x^3-5x^2+8x^2+4x+5x-9-10

-4x^3+3x^2+9x-19

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What is the inverse function of d(x) = 2x - 4?
zysi [14]

Answer:

d^{-1}(x) = \frac{x+4}{2}

Step-by-step explanation:

let d(x) = y and rearrange making x the subject, that is

2x - 4 = y ( add 4 to both sides )

2x = y + 4 ( divide both sides by 2 )

x = \frac{y+4}{2}

Change y back into terms of x, so

d^{-1}(x ) = \frac{x+4}{2}

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3 years ago
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Express the ratio as a fraction in the lowest term.500m:1km​
snow_lady [41]

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7 0
3 years ago
Anyone able to help with this question?
ELEN [110]

Answer:

This is trigonomentry

Use SOHCAHTOA

where :

s is sin

c is cos

t is tan

o is opposite (side)

h is hypotenuse (opposite of 90 degree angle)

and a is adjacent (side)

Sin = o/h

cos = a/h

tan = o/a

in this case we are looking for side BC which is the hypotenuse(h)

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since we have a and h determine what to use SIN, COS, OR TAN?

we should use Cos

they‘ve given the angle so we should do this...

Cos71 = \frac{6.3}{h}

Cos71 = \frac{6.3}{BC}

now apply algebra...

6.3/cos71= BC

BC= 19.3507869666

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It’s would be C $31.95
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