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sasho [114]
3 years ago
13

10. 4x - 7y = 3x - 7y = -15​

Mathematics
1 answer:
Varvara68 [4.7K]3 years ago
5 0

Answer:

(2/5,-1/5)

Step-by-step explanation:

solve the second equation for x

x = -7y - 1

replace the x in the first equation

4•(-7y-1) - 7y = 3

- 35y = 7

solve for y

35y = - 7  

y = - 1/5  

which gives us

   x = -7y-1

   y = -1/5

then use the y value to solve for x

   x = -7(-1/5)-1 = 2/5  

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Estimate the following difference using front-end estimation. 788.44 - 225.6
Liula [17]

Answer:

562.84

Step-by-step explanation:

5 0
4 years ago
How do you model a decimal using a fraction?​
liubo4ka [24]

Answer:

The only reason I can’t type it right now it’s cause I’m doing something important so I’m so sorry if I hade to type this out but I’m a bit busy right now And I’m trying to answer as much questions as possible. Thank you

Step-by-step explanation:

Hope this helps you

6 0
3 years ago
Read 2 more answers
What is the confidence interval estimate of the population mean percentage change in the price per share of stock during the fir
I am Lyosha [343]

Answer:

(-0.1059 ; - 0.0337)

Step-by-step explanation:

The data table is attached in the picture below:

These is a matched pair design ; which requires taking the difference of the two values for each sample :

The mean and standard deviation of the difference will be used to construct the confidence interval :

The mean of difference, dbar = Σx/n = - 0.0698

The standard deviation of difference, Sd ;

Sd = [√Σ(d - dbar)²/(n-1)] = 0.1054

n = sample size = 25

The confidence interval :

dbar ± [TCritical * Sd/√n]

Tcritical at 90% ; df = n -1 = 25 -1

Tcritical(90% , 24) = 1.1711

C.I = - 0.0698 ± (1.711 * 0.1054/√25)

C.I = - 0.0698 ± 0.0361

C.I = (-0.1059 ; - 0.0337)

5 0
3 years ago
PLEASE HELP ASAP!!!!!!
Dafna1 [17]

Answer:

Step-by-step explanation:

Just multiply the sides. For example, the roses take 8x4=32 feet. if we want to know the area of Zinnias, we multiply the sides 8x12 and remove the roses, which would be 8x12-32=96-32=60 for the Zinnias.

For a)

The roses take 8x4

Zinnias take 8x12 - roses

Snapdragons take 16x12 - roses - zinnias

Petunias take 16x20 - snapdragons - zinnias- roses

b) The entire area of the garden is 20x16=320 square feet

The area of the Zinnias(including roses) is 8x12 = 96 square feet

To get the percent, we divide the smaller number by the bigger number and multiply by 100 or in practice 96/320x100=30%

c) Let's see the progression here. The width progresses in the first rectangle by four 8 to 12, then again by four 12, 16 and again by four 16 to 20, which means that the next rectangle would have a width of 20+4=24. Doing the sale analysis for the height, we get that the increase is with 4 feet at a time or the new rectangle would have a width of 24 and height of 20, which means a total area of 480 feet. We have to subtract all other rectangles or the new area would be 480 - (20x16) = 160 square feet

8 0
3 years ago
This is for geometry and i keep getting it wrong​
vova2212 [387]

Step-by-step explanation:

As < A and < B are vertical angles so

<A = < B

5x + 12 = 6x - 11

6x - 5x = 12 + 11

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Hope it will help :)❤

7 0
3 years ago
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