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3 years ago

Simplify (−2)∙(2a−b)+3(a+b) PLz and Thanks

Mathematics

1 answer:

LuckyWell [14K]3 years ago

5 0

Answer:

-a+5b

Step-by-step explanation:

(-2)x(2a-b)+3(a+b)

Multiply

Remove Parenthesis

-2(2a-b)+3a+3b

Multiply parenthesis by -2

-4a+2b+3a+3b

collect like terms

-a+5b

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Solve for x using the distributive property. -5(x - 2) = -20

worty [1.4K]

Answer:

x=6

Step-by-step explanation:

-5(x - 2) = -20

first multiple 5 by x and -2

-5x 10 = -20

subtract 10 from 10 and -20

-5x=-30

then divide 5

x=6

8 0

4 years ago

A rancher wishes to enclose a rectangular pasture with 320 feet of fencing. the fencing will be used on three sides of the pastu

bulgar [2K]

Let each side perpendicular to the wall be x
The parallel to the wall will be 320-2x
the area will be:
A(x)=x(320-2x)
A(x)=320x-2x^2
This is a quadratic with a =-2 and b=320

Maximum area will occur where x=-b/2a
=-320/(-2*2)
=80 ft
thus the width will be 80 ft and the length will be:
length=320-2*80=160 ft

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3 years ago

Apply the distributive property to factor out the GCF. 22c + 33d=________

slava [35]

Answer:

Step-by-step explanation:

3 0

4 years ago

An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an est

MrRa [10]

Answer:

85% level of the confidence interval is

(26.337, 26.662)

Step-by-step explanation:

Explanation:-

Given the size of the sample 'n' = 295

Mean of the sample x⁻ = 26.5

The Standard deviation of the Population = 2.7

85% level of the confidence interval is determined by

$(x^{-} - Z_{0.15} \frac{S.D}{\sqrt{n} } , x^{-} + Z_{0.15} \frac{S.D}{\sqrt{n} })$

Critical value Z₀.₁₅ = 1.036

85% level of the confidence interval is determined by

$(x^{-} - Z_{0.15} \frac{S.D}{\sqrt{n} } , x^{-} + Z_{0.15} \frac{S.D}{\sqrt{n} })$

$(26.9 -1.036 \frac{2.7}{\sqrt{295} } , 26.5 + 1.036 \frac{2.7}{\sqrt{295} })$

( 26.5 - 0.1628 , 26.5+0.1628)

(26.3372,26.6628)

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3 years ago

Nikola likes to play horseshoes, where players try to score a ringer by throwing a horseshoe so it lands around a post. A player

steposvetlana [31]

Answer:

0.9 for the top box and 1.68 for the bottom box

Step-by-step explanation:

give me brainliest answered on khan academy

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3 years ago