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3 years ago

PLEASE PLEASE HELP. I’ve wasted so many points on this problem :(

Mathematics

1 answer:

aniked [119]3 years ago

5 0

Answer:

13 cm

Step-by-step explanation:

A^2+12^2=15^2

A^2+144=225

A^2=81

A=9

9x2=18

31-18=13 cm

Find the perimeter of a rectangle whose width is 3 cm and whose diagonal is 3 √5 cm long.

A^2+3^2=3√5^2

A^2+9=45

A^2=36

A=6

3+3+6+6=18 cm

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Step-by-step explanation:

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3 years ago

Find the volume of the composite figure

Margaret [11]

lets do this step by step.

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3 years ago

x - y = 3 x + y = 5 Which of the following systems is equivalent to the given system? 2x - y = 18 and x + 2y = 10 4x - 3y = 18 a

tiny-mole [99]

Answer:

None of the systems is equivalent to the given system

Step-by-step explanation:

we have the given system

$x-y=3$ ---> equation A

$x+y=5$ ---> equation B

Solve the system

Adds equation A and equation B

$x-y=3\\x+y=5\\------\\ 2x=8\\x=4$

Find the value of y

$(4)-y=3$ ------> $y=4-3=1$

The solution of the given system is the point (4,1)

we know that

If a system is equivalent to the given system, then the solution of both systems must be the same

Verify each case

case A) 2x - y = 18 and x + 2y = 10

$2x-y=18$ ---> equation A

$x+2y=10$ ---> equation B

Substitute the value of x and y in both equations and then compare the results

$x=4,y=1$

equation A

$2(4)-(1)=18$

$7=18$ ----> is not true

therefore

the system is not equivalent to the given system

case B) 4x - 3y = 18 and x + 2y = 10

$4x-3y=18$ ---> equation A

$x+2y=10$ ---> equation B

Substitute the value of x and y in both equations and then compare the results

$x=4,y=1$

equation A

$4(4)-3(1)=18$

$13=18$ ----> is not true

therefore

the system is not equivalent to the given system

case C) 2x - 3y = 3 and x + 2y = 5

$2x-3y=3$ ---> equation A

$x+2y=5$ ---> equation B

Substitute the value of x and y in both equations and then compare the results

$x=4,y=1$

equation A

$2(4)-3(1)=18$

$5=18$ ----> is not true

therefore

the system is not equivalent to the given system

7 0

3 years ago

6 + 8(x - 1) = 2(3x + 4)

Serggg [28]

The mistake was is he subtracted at the end instead of dividing, the answer is 5/7

8 0

3 years ago

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