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garri49 [273]
4 years ago
13

I NEED HELP!!!!

Mathematics
1 answer:
wolverine [178]4 years ago
7 0

Answer:

There is no smoke with an electric train:)

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If=y=1 z=2<br>(2y + z) (2y-z)​
snow_tiger [21]

Answer:

answer is 0

Step-by-step explanation:

(2×1+2)(2×1-2)

(4×0)

0

5 0
3 years ago
If x-y=6 and x^2+y^2=24, find x^3-y^3.
erik [133]

Answer:

162.06

Step-by-step explanation:

sorry i'm not the best an explaining but i'm confident in my answer.

the first thing to do is get rid of the ² in x²+y²=24, we do this by √24 which ≅4.90 (i rounded to the hundreth place)

then we have this

x-y=6

x+y=4.90

I am using the elmination method. To do that you need to get two letters to have the same coefficient (in 4x 4 is the coefficient) with oposite signs (one possitive one negitive)

In our equation here we see that the same coefficient is 0, and there is oposite signs for y. Therefore we can add the two equations and get

2x=10.9 (the y cancels out)

now we have a simple equation and all that is left is to solve it

10.9/2=5.45

x=5.45

Now we need to find y we do that by pluging the x value into one of the equations I choose the first one becasue its easiest.

(5.45)-y=6  

y= - .55

now that we have both x and y plug them into the final equation (5.45)³-(-.55)³= 161.89-(-.17) =162.06

Therefore x³-y³≅162.06!

(if you have any questions or would like to debate the answer please let me know!)

3 0
3 years ago
This item is $9000 dollar and it is 90% off how much is the item? Step by step?
Daniel [21]

Answer:

The item costs $900 after the 90% off.

Step-by-step explanation:

After the 90% off discount, the item costs (100% - 90%) the cost of the original price.

Hence, \$9000 \cdot (100\% - 90\%)

= \$9000 \cdot 10\%

= \$900

Hope this helped!

5 0
3 years ago
Read 2 more answers
Jorge has $24 on a gift card. He only uses the gift card to buy $1.75 cups of coffee. What is the total change in the amount in
user100 [1]
Jorge would have $8.25 left. This answer does not include 9 cups + the $1.75 it said he bought in the beginning. I’m pretty sure the 9 is the total amount of cups he bought. If it isn’t then subtract another $1.75 and you should get $6.50
6 0
3 years ago
Which value is the LARGEST?<br> a. 0.65<br> b. 33%<br> 3<br> C.<br> 5<br> d. 0.75
Andre45 [30]

Answer:

d.  0.75 (assuming that choice c. is 3/5)

Step-by-step explanation:

Is C. 3/5? I'm assuming it is.

Write all numbers as decimals to make it easier to compare them.

a. 0.65 = 0.65

b. 33%  = 0.33

c. 3/5  = 0.6

d. 0.75 = 0.75

Now that all numbers are written as decimals, we see that the greatest of them is 0.75

Answer: d. 0.75  (assuming that choice c. is 3/5)

8 0
4 years ago
Read 2 more answers
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