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ASHA 777 [7]
2 years ago
5

LOTS OF POINTS, EASY QUESTION

Mathematics
2 answers:
rosijanka [135]2 years ago
5 0

Answer:

1/3

Step-by-step explanation:

Take the model size and divide by the original size by using the length

7/21 = 1/3

The scale factor is 1/3

We check by using the width

5/15 = 1/3

frosja888 [35]2 years ago
4 0

Answer:

3/1....................

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A solar heating system costs $25,000 to install with a yearly operating cost of $300. An electric heating system costs $6,500 to
Stells [14]

Answer:

it should take around 4 to 5 years before you start to see a difference  

See the attachment for more info.

Step-by-step explanation:

5 0
3 years ago
A manufacturer of household washing machines wants to determine the effectiveness of the type of detergent used (three brands –
ololo11 [35]

Answer:

Two-Factor ANOVA with replication

Step-by-step explanation:

Types of detergent used ( A,B,C ) = 3

Length of time for the washing cycle : A = 18 mins, B = 20 mins, C = 22 mins

number of laundry loads = 18

significance level = 5%

The alternative hypothesis for testing the interaction is a Two-Factor ANOVA with replication this is because the factors that have variations are the : The type of detergent and the length of time for a washing cycle while the load is constant for all.

5 0
3 years ago
damita uses the pythagorean theorem to write the equation 2k² = j² to represent the triangle shown. Is she correct? Explain.​
Rudiy27

Answer:

Yes, She is correct.

Step-by-step explanation:

Pythagorean theorem:

base² + altitude² = hypotenuse²

k² + k² = j²

Add the like terms. Like terms have same variable with same power.

2k² = j²

4 0
2 years ago
What is the surface ara of a sphere with a diameter of 16cm
avanturin [10]

Answer:

1024pi cm²

Step-by-step explanation:

4pi(16)²

4pi256

1024pi

7 0
3 years ago
Read 2 more answers
Spencer spent 4 hours doing chores over the weekend. If he spent 2/3
Troyanec [42]

Answer:

6 chores

Step-by-step explanation:

ok so,

4 hours=240minutes

2/3of an hour= 60×2/3

=40 minutes

so since one chore needs 40 minutes, then:

40/240= 6

so in 240 minutes/4 hours, Spencer can do 6 chores.

6 0
3 years ago
Read 2 more answers
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