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3 years ago

Pls help i give brainliest

Mathematics

2 answers:

Sedaia [141]3 years ago

8 0

Answer:

Step-by-step explanation:

Take the mean of each row in the accidents reported column so for example 0-4 would be 0+4/2 = 2

Then times it by the frequency which in this case is 15:

2 x 15 = 30

Do this for each rows and then add it all up:

30 + 28 + 120 + 34 = 212

Then divide it by number of row which in this case is 4:

212/4 = 53

matrenka [14]3 years ago

3 0

Answer:

7.75 ( 7.8 to 1 dp)

Step-by-step explanation:

Mean = sum of frequency over total number of items ( in this case 4 items )

Hence Mean = 31/ 4

Mean = 7.75 ( 7.8 to 1dp)

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Help me with this math question please I'm giving away brainliests

DedPeter [7]

Answer:

I believe this is neither a direct or inverse relationship.

Step-by-step explanation:

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3 years ago

3(x+14)=42 plz need help now

lina2011 [118]

Answer:

Step-by-step explanation:

So we have the equation:

$3(x+14)=42$

Divide both sides by 3:

$x+14=14$

Subtract 14:

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3 0

2 years ago

Read 2 more answers

If a=2b^3 and b= -1/2c ^-2,express a in terms of c.

ElenaW [278]

Answer:

Part 1) $a=-\frac{1}{4c^6}$

Part 2) $a=-\frac{1}{4c^{-6}}$

Step-by-step explanation:

Part 1) we have

$a=2b^{3}$ ----> equation A

$b=-\frac{1}{2}c^{-2}$ ----> equation B

substitute equation B in equation A

$a=2(-\frac{1}{2}c^{-2})^{3}$

Applying property of exponents

$(x^{m})^{n}=x^{m*n}$

$x^{-m} =\frac{1}{x^{m}}$

$a=2(-\frac{1}{2}c^{-2})^{3}=2(-\frac{1}{2})^3(c^{-2})^{3}=2(-\frac{1}{8})(c^{-6})=-\frac{1}{4c^6}$

therefore

$a=-\frac{1}{4c^6}$

Part 2) we have

$a=2b^{3}$ ----> equation A

$b=-\frac{1}{2c^{-2}}=-\frac{c^{2}}{2}$ ----> equation B

substitute equation B in equation A

$a=2(-\frac{c^{2}}{2})^{3}$

Applying property of exponents

$(x^{m})^{n}=x^{m*n}$

$x^{-m} =\frac{1}{x^{m}}$

$a=2(-\frac{c^{2}}{2})^{3}=2(-\frac{c^{6}}{8})$

simplify

$a=-\frac{c^{6}}{4}$

therefore

$a=-\frac{1}{4c^{-6}}$

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3 years ago

Convert 25 feet per second to miles per hour, with work show.

bulgar [2K]

we know there are 5280 feet in 1 mile, and there are 3600 seconds in 1 hour.

$\bf \cfrac{25 \underline{ft}}{sec}\cdot \cfrac{mi}{5280 \underline{ft}}\cdot \cfrac{3600 \underline{sec}}{hr}\implies \cfrac{25\cdot 3600}{5280}\cfrac{mi}{hr}\implies \cfrac{375}{22}\cfrac{mi}{hr}\implies 17.0\overline{45}\frac{mi}{hr}$

5 0

3 years ago

Math - algebra (9th grade) please include work

Naily [24]

Answer:

Step-by-step explanation:

Y) $\frac{x+4}{8}$ = 3

*multiply both sides by 8 - cancels out 8 in denominator*

x + 4 = 24

*subtract 4 from both sides*

x = 20

E) $\frac{x-5}{2}$ = 1

*multiply both sides by 2 - cancels out 2 in denominator*

x - 5 = 2

*add 5 on both sides*

x = 7

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* multiply both sides by 4 - cancels out 4 in denominator*

x + 2 = 8

*subtract 2 from both sides*

x = 6

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2 years ago

Pls help i give brainliest​

Pls help i give brainliest