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wlad13 [49]
3 years ago
12

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:

67

Step-by-step explanation:

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I need these answers by 1:30
hodyreva [135]

Answer:

its 4

Step-by-step explanation:

because u divied

3 0
3 years ago
in an election a candidate go 82 votes.He won the election beating his rival candidate by 576 votes.How many votes were pull?​
Tanya [424]

Answer:

if you like please mark me brainlaist

Step-by-step explanation:

thanks

8 0
3 years ago
How do you multiply
vodomira [7]

You multiply using the multiplication table. Multiplication is one of the four basic operations in arithmetic, along with addition, subtraction, and division. Multiplication can actually be considered repeated addition, and you can solve simple multiplication problems by adding repeatedly. For larger numbers, you'll want to do long multiplication, which breaks the process down into repeated simple multiplication and addition problems. You can also try a shortcut version of long multiplication by splitting the smaller number in the problem into tens and ones, but this works best when the smaller number is between 10 and 19.

7 0
3 years ago
Read 2 more answers
Trailblazers Inc. is known for making high quality suits. If they take 9 days to stitch 90 suits, how long will it take them to
irina [24]

Answer:

It will take them a total of 18 days because if it took them 9 days to make 90 multiply that by 2 to get 180 and you get the answer.

Step-by-step explanation:

9 = 90

9 x 2 = 18

90 x 2 = 180

you make 180 suits in 18 days

8 0
3 years ago
Ayesha has a theory about two digit numbers that have a larger tens digit than ones digit. she says that reversing the digits an
stira [4]
<span>Ayesha's right.  There's a good trick for knowing if a number is a multiple of nine called "casting out nines."  We just add up the digits, then add up the digits of the sum, and so on.  If the result is nine the original number is a multiple of nine.  We can stop early if we recognize if a number along the way is or isn't a multiple of nine.  The same trick works with multiples of three; we have one if we end with 3, 6 or 9.

So </span>1284673 <span>has a sum of digits 31 whose sum of digits is 4, so this isn't a multiple of nine.  It will give a remainder of 4 when divided by 9; let's check.

</span>1284673 = 142741 \times 9 + 4 \quad\checkmark<span>

</span>Let's focus on remainders when we divide by nine. The digit summing works because 1 and 10 have the same remainder when divided by nine, namely 1.  So we see multiplying by 10 doesn't change the remainder.  So 100 \times a + 10 \times b + c has the same remainder as a+b+c.

When Ayesha reverses the digits she doesn't change the sum of the digits, so she doesn't change the remainder.  Since the two numbers have the same remainder, when we subtract them we'll get a number whose remainder is the difference, namely zero. That's why her method works.
<span>
It doesn't matter if the digits are larger or smaller or how many there are. We might want the first number bigger than the second so we get a positive difference, but even that doesn't matter; a negative difference will still be a multiple of nine. Let's pick a random number, reverse its digits, subtract, and check it's a multiple of nine:

</span>813219543092195 - 591290345912318 =  221929197179877 = 9 \times 24658799686653 \quad \checkmark

6 0
3 years ago
Read 2 more answers
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