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3 years ago

The length of a rectangle is three less than twice the width. If the perimeter is 156cm, find it’s dimensions.

Mathematics

1 answer:

Monica [59]3 years ago

8 0

Answer:

length = 47, width = 25

Step-by-step explanation:

L = 2W - 3

2L + 2W = 156

2( 2w -3) + 2W = 156

4w - 6 + 2W = 156

6W = 150

W = 25

L = 2(25) - 3

L = 47

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3 cups a b c contain only salt and water the different mixtures are a salt:water 3:22 b Salt 1/8 c salt 12.75% what cup has the

ddd [48]

Answer:

Cup A

Step-by-step explanation:

Cup A

Salt: Water = 3:22

Expressed as a percentage

$\dfrac{3}{22} \times 100 = 13.6\%$

Proportion of Salt =13.6%

Cup B

Salt: Water = 1:8

Expressed as a percentage

$\dfrac{1}{8} \times 100 = 12.5\%$

Proportion of Salt =12.5%

Cup C

Proportion of Salt = 12.75%

Therefore, Cup A has the greatest proportion of salt.

7 0

3 years ago

Make x the subject of h = 4(x + 3y) + 2

Stolb23 [73]

Answer:

x= (h-12y-2)/4

Step-by-step explanation:

First expand the brackets so its 4x+12y+2=h

Then subtract 12y and 2 from both sides

This maxes 4x=h-12y-2

then divide by 4

so its x= (h-12y-2)/4

(you can simplify if you want you dont need to)

3 0

4 years ago

Let f(x)=6/-2+2e^-0.3x. what is f(4)? enter your answer rounded to the nearest tenth

pochemuha

The value of the function f(x)=6/-2+2 $e^{-0.3x}$ at x=4 after rounded to the nearest tenth is -2.4.

Given Function of x : f(x)=6/-2+2 $e^{-0.3x}$

The given function showing the relationship between x and f(x) is f(x)=6/-2+2 $e^{-0.3x}$ where e is exponential and we have to find the value of f(4) by just putting the value of x=4 in the given function and round to the nearest tenth means replacing a number with an approximate value.

f(4)=6/-2+2 $e^{-0.3*4}$ ( The value of e is 2.7812)

f(4)=-3+2 $e^{-1.2}$

f(4)=-3+2*0.30119 (The value of $e^{-1.2}$ is 0.30119)

f(4)=-3+0.60238

f(4)=-2.3972

Round -2.3972 to tenth is -2.4.

Hence the value of function of at x=4 is -2.4.

Learn more about function at brainly.com/question/10439235

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2 years ago

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