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3 years ago

Can someone please help me with this problem

Mathematics

2 answers:

vfiekz [6]3 years ago

8 0

Answer:

Step-by-step explanation:

Hi,

So from Andre's perspective, if he receive money that would be positive (cuz that will be adding to his collection) whereas, if he has to give money away that would be negative (cuz he would have to pay out of his pocket).

Think about it like this, people generally feel positive when they receive money and feel negative when they give away money. Apply this same concept.

Therefore,

A) Andre received money so = $25

B) Andre earned money so = $18

C) Andre had to give money away to buy the book so = - $10

D) Zero (0) would mean that he did not gain or lose any money.

kykrilka [37]3 years ago

4 0

Answer:

a. +25

b. +18

c. -10

d. 0 could represent the starting amount.

Step-by-step explanation:

Andy gets money from his uncle, so he is earning money, which makes it a positive.

Similar to b, Andy earns $18. He is earning it, so it is positive.

With C, he is losing money by paying for something, so it is negative.

Please give me brainliest if I helped!

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The total distance they must travel is 296 miles.

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Read 2 more answers

X+ y + z = -3 3y - Z = 4 2x- y - 2z = -5

snow_lady [41]

Answer:

(-3, 1, -1)

Step-by-step explanation:

x + y + z = -3 --> (1)
3y - z = 4 --> (2)
2x - y - 2z = -5 --> (3)

Add up (1) and (2)

x + 3y + y + z - z = -3 + 4 ⇒ x + 4y = 1 --> (4)

Double (2) and subtract from (3)

2x - y - 2z - 2(3y - z) = -5 - 2(4) ⇒ 2x - y - 2z - 6y + 2z = -5 - 8
2x - 7y = -13 --> (5)

Double (4) and subtract (5)

2(x + 4y) - 2x + 7y = 2 + 13 ⇒ 2x + 8y - 2x + 7y = 15 ⇒ 15y = 15 ⇒ y = 1

Finding x

x + 4(1) = 1 ⇒ x = 1 - 4 ⇒ x = -3

Finding z

-3 + 1 + z = -3 ⇒ z = -1

So the answer is:

(-3, 1, -1)

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3 years ago