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3 years ago

Simplify -r+8(-5r-2)

Mathematics

1 answer:

Lapatulllka [165]3 years ago

6 0

Answer:

-41r - 16

Step-by-step explanation:

Step 1 :

Step 2 :

Pulling out like terms :

2.1 Pull out like factors :

-5r - 2 = -1 • (5r + 2)

Equation at the end of step 2 :

-r + -8 • (5r + 2)

Step 3 :

Step 4 :

Pulling out like terms :

4.1 Pull out like factors :

-41r - 16 = -1 • (41r + 16)

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Which two values of X are roots of the polynomial below 4x^2-6x+1

PtichkaEL [24]

$4x^2-6x+1=0\\\\a=4,\ b=-6,\ c=1\\\\\Delta=b^2-4ac\\\\\Delta=(-6)^2-4(4)(1)=36-16=20\\\\\sqrt\Delta=\sqrt{20}=\sqrt{4\cdot5}=\sqrt4\cdot\sqrt5=2\sqrt5\\\\x_1=\dfrac{-b-\sqrt\Delta}{2a},\ x_2=\dfrac{-b+\sqrt\Delta}{2a}\\\\x_1=\dfrac{-(-6)-2\sqrt5}{2\cdot4}=\dfrac{3-\sqrt5}{4}\\\\x_2=\dfrac{-(-6)+2\sqrt5}{2\cdot4}=\dfrac{3+\sqrt5}{4}$

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3 years ago

4 For each nth term, find the 50th term. a 4n - 5

alukav5142 [94]

4 x 50 = 200
200 - 5 = 195
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3 years ago

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Which decimal is equivalent to -3 1/8? *20 points*

kondaur [170]

Answer: -3.125

Step-by-step explanation: -1 divided by 8 = .125

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2 years ago

(1/2-6)-(1/6x-8) plz i need help for this test

STatiana [176]

Answer:

simplified answer is: -x-15/6

evaluated answer is; -(x-15/6)

Step-by-step explanation: if correct brainliest plz

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2 years ago

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A tank in the shape of a hemisphere has a radius of 7 feet. if the liquid that fills the tank has a density of 93 pounds per cub

professor190 [17]

The total weight of the liquid that filled the hemispheric tank to the nearest full pounds is 66775 pounds.

<h3>What is the volume of an hemisphere?</h3>

An hemisphere is half of a sphere. Therefore,

volume = 2 / 3 πr³

where,

r = radius

Therefore,

r = 7 feet

volume = 2 / 3 × 3.14 × 7³

volume = 2 / 3 × 3.14 × 343

volume = 2154.04 / 3

volume = 718.013333333

volume = 718.013

Therefore,

density = mass / volume

93 = mass / 718.013

mass = 718.013 × 93

mass = 66775.24

mass ≈ 66775 pounds

learn more on hemisphere here: brainly.com/question/14527816

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2 years ago