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3 years ago

Solve the system of equations. Write you answer as an ordered pair.

Mathematics

1 answer:

lawyer [7]3 years ago

6 0

Answer:

x = -4 y = -5

Step-by-step explanation:

2x + 3 = -x - 9

3x + 3 = -9

3x = -12

x = -4

y = - (-4) - 9

y = 4 - 9

y = -5

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Solve the following multiplication and division problems.

algol13

Answer:

a. 22.5 km

b. 267.52 m

c. 95 m

d. $(4.2)(10^{-5})$ km

Step-by-step explanation:

a. You can convert from hectometers to kilometers, and then you can make the multiplication:

$\frac{5hm}{10}=0.5km$

$(3km)(0.5km)(15)=22.5km$

b. You can convert from centimeters to meters, and then you can make the multiplication:

$\frac{44cm}{100}=0.44m\\(19m)(0.44m)(32)=267.52m$

c. You only need to divide 1,140 meters by 12:

$\frac{1,140m}{12})=95m$

d. You can convert from hectometers to kilometers, from decameters to kilometers and from meters to kilometers, and divide this by 15:

$\frac{6hm}{10}=0.6km$

$\frac{7dam}{100}=0.07km$

$\frac{5m}{1000}=0.005km$

$\frac{(3km)(0.6km)(0.07km)(0.005km)}{15}=(4.2)(10^{-5})$ km

5 0

3 years ago

Which expression is equivalent to 28 + 7? Prove your answer by showing your work.

OverLord2011 [107]

Answer:

ok so first lets find the answer to the original question

28+7=35

so lets find which one is equal to 35

7(4+1)=28+7=35 yes

4(7+1)=28+4=32 no

4(7+3)=28+12=40 no

7(4+7)=28+49=77 no

a is the answer

Hope This Helps!!!

6 0

3 years ago

All perfect square are divisible by 2<br>

vesna_86 [32]

Answer:

ofcourse all perfect squares are divisible by 2

7 0

3 years ago

A piece of copper has a mass of 58kg and displaces 5918ml. What is its density?

uranmaximum [27]

Answer:

8.96 g/cm2

Step-by-step explanation:

3 0

3 years ago

A number rounded to the nearest ten is 550. When it is rounded to the nestest hundred,the number become 600 which could it ve?

amid [387]

Answer:

550-554

Step-by-step explanation:

550 is rounded to 550, and also rounded to 600. Same with all the other numbers. :)

8 0

3 years ago