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sdas [7]
2 years ago
5

Evaluate t-7 for t =20

Mathematics
2 answers:
Luda [366]2 years ago
5 0

Answer:

The answer is 14

Step-by-step explanation:

t - 7 ; t = 20

20 - 7 = 14

Thus, The answer is 14

<u>-</u><u>TheUnknownScientist</u><u> 72</u>

belka [17]2 years ago
5 0
T - 7
20 - 7 = 13

ANSWER: 13
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The answer to your question is 11 world championships
8 0
2 years ago
A first number plus twice a second number is 14. twice the first number plus the second totals 31. find the numbers.
topjm [15]
------------------------------------------------------------
Define the two numbers
-----------------------------------------------------------
Let the first number be x.
Let the second number be y.

------------------------------------------------------------
Form equations and solve x and y
------------------------------------------------------------
x + 2y = 14 ------------------ (1)
2x + y = 31 ------------------ (2)

------------------------------------------------------------
Equation (1) x 2
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2x + 4y = 28  ---------------(1a)

------------------------------------------------------------
Equation (1a) - 2
------------------------------------------------------------
3y = 28 - 31
3y = -3
y = -1

------------------------------------------------------------
Substitute y = -1 into (1)
------------------------------------------------------------
x + 2(-1) = 14
x -2 = 14
x = 14 + 2
x = 16

------------------------------------------------------------
Answer: x =16, y = -1
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4 0
3 years ago
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. Th
Pepsi [2]

Answer:

Step-by-step explanation:

a) The formula for determining the confidence interval for the difference of two population means is expressed as

Confidence interval = (x1 - x2) ± z√(s²/n1 + s2²/n2)

Where

x1 = sample mean of group 1

x2 = sample mean of group 2

s1 = sample standard deviation for data 1

s2 = sample standard deviation for data 2

For a 90% confidence interval, the z score is 1.645

From the information given,

x1 = 24.5

s1 = 4.3

n1 = 200

x2 = 16.3

s2 = 3.1

n2 = 200

x1 - x2 = 24.5 - 16.3 = 8.2

z√(s1²/n1 + s2²/n2) = 1.645√(4.3²/200 + 3.1²/200) = 1.645√0.1405

z = 0.62

Therefore, the 90% confidence interval is 8.2 ± 0.62

Interpretation:

B.The researchers are 90% confident that the difference of the means is in the interval.

b) B.Since the 90% confidence interval does not contain​ zero, the results suggest that priming does have an effect on scores.

8 0
2 years ago
Simplify the expression please help me with this I need help now plz and thank you
Tema [17]

Answer:

68

Step-by-step explanation:

4 + (11 - 3)^2

= 4 + 8^2

= 4 + 64

= 68

7 0
2 years ago
Read 2 more answers
2x-2-(2x-1)=x+4-1-(-3x)
Ainat [17]

Answer:

-1=x

Step-by-step explanation:

2x-2-(2x-1)=x+4-1-(-3x)

2x-2-2x+1=x+4-1+3x

-1=4x+3

-4=4x

-1=x

7 0
2 years ago
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