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olchik [2.2K]
3 years ago
11

A student wants to conduct an investigation to find out how much heat energy a 100-gram rock can transfer to water. He has the r

ock and 300 grams of water in an insulated container. The water is at 20°C. He heats up the rock to 50°C, and places it in the water. What is the most important data for the student to record for this investigation?
I need help with 7th grade science
Mathematics
1 answer:
gogolik [260]3 years ago
3 0

Answer:

it b because i did it on study island

Step-by-step explanation:

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(SAT Prep) Find the value of x.
emmainna [20.7K]

Answer:

120 deg

Step-by-step explanation:

Draw a horizontal line that passes vertices of 2 angles 125 deg and 115 deg.

This line is perpendicular with 2 vectors.

Apply the property of vertical angles and the sum of 3 angles in a triangle.

x = 180 - (125 - 90) - (115 - 90) = 120 deg

5 0
3 years ago
PLEASE HELP ME PLEASE??
BigorU [14]

Answer:

Table A is correct

Step-by-step explanation:

All you have to do is multiply the hours by 5 to get the answer.

Table B is adding not multiplying.

<em>Can I please have BRAINLIEST?</em>

4 0
3 years ago
Can someone please explain to me how to do this!? From 58 books to 65 books?
Inessa [10]

The way this question is worded is quite confusing. If all you have given is ‘58 books to 65 books’, maybe you mean a range? In that case the range would be 7. Or you could be talking about how many books it would take for 58 to get to 65. In this case, it would also be 7.


7 0
3 years ago
A sample of 64 observations has been selected to test whether the population mean is smaller than 15. The sample showed an avera
KengaRu [80]

Answer:

Test statistic = - 0.851063

- 2.520463

Step-by-step explanation:

H0 : μ ≥ 15

H1 : μ < 15

Sample mean, xbar = 14.5

Sample standard deviation, s = 4.7

Sample size = 64

Teat statistic :

(xbar - μ) ÷ (s/√(n))

(14.5 - 15) ÷ (4.7/√(64))

= - 0.851063

The critical value at α = 0.05

Using the T - distribution :

Degree of freedom, df = 64 - 1 = 63

Tcritical(0.05, 63) = 1.6694

Test statistic - critical value

-0.851063 - 1.6694

= - 2.520463

8 0
3 years ago
PLEASE HELP!!!! 5. POINTS EACH.
KonstantinChe [14]

Answer:

question 3: 1/3 question 4: 5/7 question 5: 2/3

6 0
3 years ago
Read 2 more answers
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