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damaskus [11]
3 years ago
5

Can someone help me asap?!?:( 2x-y=3 x+2y=-6

Mathematics
2 answers:
erastovalidia [21]3 years ago
8 0
X= 2
Y= 0

I think this should be the answer
Dmitry_Shevchenko [17]3 years ago
7 0
The answer I got is x=0 and y=-3, I Hope this help☺️
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What number is 12 and a half percent of 64
Mkey [24]
<span>12.5% of 64=8 Would be the answer to this.</span>
8 0
3 years ago
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Is 202.98% greater than 1 or is 67.14% greater than 1?
oee [108]

Answer:

  • 202.98% > 1
  • 67.14% < 1

Step-by-step explanation:

100% = 1

202.98% is more than 100%, so is more than 1.

67.14% is less than 100%, so is less than 1.

7 0
3 years ago
Explain tge distace formula. then use it to calculate the distance between A(1,1) and B(7,-7).
Juliette [100K]
The distance formula is based on the Pythagorean Theorem:

Distance = Square Root [(X2 - X1)^2<span> + (Y2 - Y1)^</span>2<span>]
</span>Distance = Square Root [(7 -1)^2 + (-7 -1)^2]
Distance = Square Root [ 6^2 + -8^2]Distance = Square Root [ 36 + 64 ]Distance = Square Root [100 ]Distance = 10
Source:http://www.1728.org/distance.htm

5 0
3 years ago
A psychologist would like to examine the effect of fatigue on mental alertness. An attention test is prepared which requires sub
lianna [129]

Answer:

The calculated value of t= 0.1908 does not lie in the critical region t= 1.77 Therefore we accept our null hypothesis that  fatigue does not significantly increase errors on an attention task at 0.05 significance level

Step-by-step explanation:

We formulate null and alternate hypotheses are

H0 : u1 < u2 against Ha: u1 ≥ u 2

Where u1 is the group tested after they were awake for 24 hours.

The Significance level alpha is chosen to be ∝ = 0.05

The critical region t ≥ t (0.05, 13) = 1.77

Degrees of freedom is calculated df = υ= n1+n2- 2= 5+10-2= 13

Here the difference between the sample means is x`1- x`2= 35-24= 11

The pooled estimate for the common variance σ² is

Sp² = 1/n1+n2 -2 [ ∑ (x1i - x1`)² + ∑ (x2j - x`2)²]

= 1/13 [ 120²+360²]

Sp = 105.25

The test statistic is

t = (x`1- x` ) /. Sp √1/n1 + 1/n2

t=   11/ 105.25 √1/5+ 1/10

t=  11/57.65

t= 0.1908

The calculated value of t= 0.1908 does not lie in the critical region t= 1.77 Therefore we accept our null hypothesis that  fatigue does not significantly increase errors on an attention task at 0.05 significance level

5 0
3 years ago
Events A and B are mutually exclusive. Also P(A) =0.2 and P(B) = 0.37. What is P(A or B)
Alchen [17]

Answer:

0.074

Step-by-step explanation:

cause in probability when two events are exclusive we use multiplication rule

7 0
3 years ago
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