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Feliz [49]
3 years ago
5

What is the value of -2xy if x = -1 and y = 6? 8 12 26 -12

Mathematics
1 answer:
Elena L [17]3 years ago
3 0
12 would be your answer
-2*-1= 2
2*6=12
so 12
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A customer buys five cans of baked beans, four packets of brown sugar and two packets of biscuits from a supermarket.He gives th
Naily [24]
Can of baked beans = x 
packet of brown sugar = y
packet of biscuit = z

5x + 4y + 2z = 150 - 26 ⇒ 5x + 4y + 2z = 124 is the total cost of all items.

can of baked beans = x = 1/2 of z
packet of sugar = y = z - 3

5(z/2) + 4(z-3) + 2z = 124
5z/2 + 4z - 12 + 2z = 124
5z/2 + 6z = 124 + 12
2(5z/2 + 6z) = 2(136)
5z + 12z = 272
17z = 272
z = 16 cost of a packet of biscuit.

x = 1/2 of z = 16/2 = 8 cost of a can of baked beans
y = z - 3 = 16 - 3 = 13 cost of a packet of sugar

5x + 4y + 2z = 124
5(8) + 4(13) + 2(16) = 124
40 + 52 + 32 = 124
124 = 124

8(8) + 1(13) + 6(16) = 64 + 13 + 96 = 173 total cost on question 3.
7 0
3 years ago
Can someone please please please help me it’s ergent
JulsSmile [24]

Answer:

D 192

Step-by-step explanation:

used:  new: total

4:          1     :  5

We have 240 stamps

240/5 = 48

Multiply each number by 48

used:  new: total

4*48:   1*48  :  5*48

192  :  48     :  240

There are 192 used stamps and 48 new stamps in his collections

7 0
3 years ago
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Step-by-step explanation:

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2 years ago
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Answer:

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Step-by-step explanation:

Multiply 52 by 60 and it equals 3120

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2 years ago
Which of the following sets of numbers is a Pythagorean triple?
katrin2010 [14]
The awnser is would be 42,40,58
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2 years ago
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