3 years ago

Solve the system of equations below by elimination. -2x-4y=-4 -x+7y=-20

Mathematics

1 answer:

Alik [6]3 years ago

5 0

Answer:

Step-by-step explanation:

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Evaluate the expression.

Zinaida [17]

Answer:

-2(10(-4))²

-2(-40)²

-2 × 1600

= -3200

6 0

2 years ago

Chris and Josh have a total of 1,800 stamps in their collections, Josh and Jessica have a total of 2,200 stamps, and Jessica and

LiRa [457]

Answer: 3000 stamps

Step-by-step explanation:

Given

Chris and Josh have 1800 stamps

Josh and Jessica have 2200 stamps

Jessica and Chris have 2000 stamps

Suppose Chris, Josh, and Jessica have $x,y, \text{and}\ z$ stamps

$\therefore x+y=1800\quad \ldots(i)\\\Rightarrow y+z=2200\quad \ldots(ii)\\\Rightarrow z+x=2000\quad \ldots(iii)\\\text{Add (i), (ii), and (iii)}\\\Rightarrow 2(x+y+z)=1800+2200+2000\\\Rightarrow x+y+z=3000$

Thus, all three have 3000 stamps

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2 years ago

Julian wrote this number pattern on the board:

geniusboy [140]

Answer:

Step-by-step explanation:

10, 24 and 38 are composite numbers.

(10 can be divided by 5 and 2; 24 can be divided by 8, 3, 12 and 2; 38 can be divided by 19 and 2).

The others are prime numbers.

3 0

3 years ago

Micah and jason made parallelogram shaped stained glass windows with the same area. the height of micahs window is 9 inches and

34kurt

Answer:

It would be 15 inches.

Step-by-step explanation:

Because the windows have to have the same area, you would have to make the base x height equal to 90. 90 divided by 6 is 15

7 0

2 years ago

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Which figure has two circular faces?

Vladimir79 [104]

Answer:

Figure A

Step-by-step explanation:

Hope it helps.

7 0

2 years ago

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