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2 years ago

1. Simplify: (-9x3 + 4x2 – 5) - (14x2 - 10x - 3) Show work please

Mathematics

1 answer:

zimovet [89]2 years ago

3 0

Answer:

I got -9x^3-10x^2+10x-2

Step-by-step explanation:

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I WILL GIVE BRAINLYEST

goldenfox [79]

A.up and to the right is the answer

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3 years ago

A surveyor sights the far bank of a river at an angle of 110° to the near bank. She then moves 75 feet upriver and sights the sa

Leya [2.2K]

Answer:

Correct answer is 54.82 ft.

Step-by-step explanation:

First of all, let us label the diagram and do the construction as per the attached answer image.

Let us consider $\triangle ABC$ :

$\angle B = 90^\circ\\\angle ACB = 180-110 = 70^\circ$

Let side AB = d ft and let side BC = x ft

We need to find AB to find the shortest distance across the river.

Using trigonometric identity of tangent:

$tan\theta = \dfrac{Perpendicular}{Base}$

$tan 70 = \dfrac{d}{x}\\\Rightarrow x = \dfrac{d}{tan70} = 0.36d ..... (1)$

Now, let us have a look at another right angled triangle ABD:

Let us consider $\triangle ABC$ :

$\angle B = 90^\circ\\\angle ADB = 180-150 = 30^\circ$

side AB = d ft and side BD = x+75 ft

Using trigonometric identity of tangent:

$tan\theta = \dfrac{Perpendicular}{Base}$

$tan 30 = \dfrac{d}{x+75}\\\text{Using equation (1)}:\\0.577 = \dfrac{d}{0.36d+75}\\\Rightarrow 0.207d + 43.27 = d\\\Rightarrow 0.793d = 43.27\\\Rightarrow d \approx 54.82\ ft$

Correct answer is 54.82 ft.

7 0

3 years ago

What is the ratio 25 to 45 as a simplified fraction

fenix001 [56]

Reducing the fractions, it is also true that:
Part A = 5/14 of the whole
Part B = 9/14 of the whole

6 0

3 years ago

HEY :} can you help me..thanks 2% of 350 285% of 200 24 red marbles is 40% of ___ marbels 12 is __% of 200

Luba_88 [7]

2% of 350 = 7

285% of 200 = 570

24 red marbles is 40% of 60 marbles

12 is 6% of 200

Hope this helps!!!
~Kiwi

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3 years ago

Which statements are true regarding the diagram? Check all that apply.

dem82 [27]

Answer:

1, 2, 3, 6

Step-by-step explanation:

I don't really know how to explain this but if the only change between the two triangles is that it was reflected, then there was no change of any of the angles or side lengths, you just have to make sure you match up the rights angles and the right sides.

4 0

3 years ago

Read 2 more answers