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ch4aika [34]
2 years ago
6

IF YOU GET THIS RIGHT YOU GET BRAINLIEST

Mathematics
2 answers:
Kryger [21]2 years ago
6 0

Answer:

13

Step-by-step explanation:

25 x 2 = 50. 10% of 70 equals 7. 50 + 7 =  57. 70 - 57 = 13.

Readme [11.4K]2 years ago
6 0

Cards given to her friend brad + cards sold online = cards givin

25+25=50

Amount of cards + cards givin = amount left

70-50=20

10% of 20=2

20-2=18

Tasha has 18 left

Hope this helps

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Compare Look at these equations. Do you think they are all linear equations? Can they
Georgia [21]

Answer:

Yes they can all be written in y = mx + b. You just have to move the terms around.

Step-by-step explanation:

y = 2x -3, this is already in slope-intercept form

Now, y - 2 = x + 2: We can add 2 on both sides to cancel out the one on the left side:

y - 2 = x + 2

y - 2 + 2 = x + + 2

y = x + 4 <-- This is in y = mx + b form

Now the last one, 3x = 9 + 3y

We can first divide all terms by 3,

3x = 9 + 3y

/3     /3   /3

x = 3 + y: Then we can subtract 3 from both sides:

x - 3 = 3 + y - 3

x - 3 = y

These are all linear equations because none of the x's have bigger powers than 1. x^2 is a quadratic equation and x^3 is cubic equation.

6 0
2 years ago
Solve, 3x+18&gt;7, is the question​
Lelu [443]

Answer:

I hope this helps

Step-by-step explanation:

give me braineast

3 0
2 years ago
Can someone please help me with this question?
Alinara [238K]

Answer:

im pretty sure its a

Step-by-step explanation:

because the water level is pretty much the same even when theres more swimmers

4 0
2 years ago
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lina2011 [118]

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3 0
2 years ago
Read 2 more answers
The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. A
Montano1993 [528]

Answer: (14.4, 17.2)

Step-by-step explanation: We are to construct a 98% confidence interval for mean household usage of electricity.

We have been given that

Sample size (n) = 872

Sample mean (x) = 15.8

Population standard deviation (σ) = 1.8

The formulae that defines the 98% confidence interval for mean is given below as

u = x + Zα/2 × σ/√n...... For the upper limit

u = x - Zα/2 × σ/√n...... For the lower limit

Zα/2 = critical value for a 2% level of significance in a two tailed test = 2.33

By substituting the parameters we have that

For upper tailed

u = 15.8 + 2.33 × (1.8/√872)

u = 15.8 + 2.33 (0.6096)

u = 15.8 + 1.4203

u = 17.2

For lower tailed

u = 15.8 - 2.33 × (1.8/√872)

u = 15.8 - 2.33 (0.6096)

u = 15.8 - 1.4203

u = 14.4

Hence the 98% confidence interval for population mean usage of electricity is (14.4kwh, 17.2kwh)

4 0
3 years ago
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