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2 years ago

14

Mark earned a 64 on his last science quiz. If Mark’s z-score was -2.8 and the standard deviation was 10, find the mean grade on

the quiz.

1 answer:

docker41 [41]2 years ago

8 0

Answer:

he score is 2.15 standard deviations above the mean.

Step-by-step explanation:

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Can any one please help me in this the teacher did not explain this it have to be in the lowest term also no decimal answer than

Zinaida [17]

Answer:

Step-by-step explanation:

$A . -5+3x =-41\\3x=-41+5\\3x = -36\\\frac{3x}{3} =\frac{-36}{3} \\x = -12\\\\\\\\\\B. 7x-4=-2x+11\\Collect-like-terms\\7x+2x=11+4\\9x=15\\\frac{9x}{9} =\frac{15}{9} \\\\x = \frac{5}{3} \\\\C. \frac{-4x}{5} =8\\Cross-multiply\\-4x=40\\\frac{-4x}{4} =\frac{40}{-4} \\x = -10\\\\D. \frac{x}{3} -\frac{1}{2} =\frac{1}{4} \\\frac{x}{3} =1/4+1/2\\\frac{x}{3} = \frac{3}{4} \\Cross-multiply\\4x =9\\4x/4 =9/4\\x = 9/4\\$

$E . -4(6x+1)+3 =11+2(x+2)\\-24x-4+3=11+2x+4\\Collect-like-terms\\-24x-2x=11+4+4-3\\-26x =16\\\frac{-26x}{-26} =\frac{16}{-26}\\ x = -\frac{8}{13}$

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2 years ago

In Algebra, the letters used to

Alborosie

Answer:

Variables

Step-by-step explanation:

6 0

2 years ago

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Please help and thank you

egoroff_w [7]

Answer:

$\large\boxed{D.\ -\dfrac{4}{3}$

Step-by-step explanation:

$2|3x-3|-6$

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2 years ago

Read 2 more answers

Find the area of the kite p=17 q =15.3

Semenov [28]

Answer:

$\large\boxed{A=130.05}$

Step-by-step explanation:

The formula of an area of a kite:

$A=\dfrac{pq}{2}$

p, q - diagonals

We have p = 17 and q = 15.3. Substitute:

$A=\dfrac{(17)(15.3)}{2}=\dfrac{260.1}{2}=130.05$

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2 years ago

Please need help it’s due today

jeka94

Answer:

B. David's sprinkler uses less water per minute.

Step-by-step explanation:

David's sprinkler uses 10 gallons every 5 minutes, which is 2 gallons a minute.

George's sprinkler uses 6 gallons a minute, which means it uses more.

David's sprinkler uses less and it uses exactly 2 gallons a minute.

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2 years ago