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Eva8 [605]
3 years ago
7

How can you determine the number of solutions for an equation

Mathematics
1 answer:
ryzh [129]3 years ago
5 0
The way to determine the number of solutions is to complete the problem in multiple different ways.
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Four more than seven times a number is 12.” Write an equation that represents the statement. Then solve.
Leona [35]

7x + 4 = 12

7x = 12-4

7x = 8

x = 7/8

3 0
3 years ago
Mia is finally able to upgrade her cellphone. The one she wants costs $220 but she is able to get it for 60% off. She has a coup
Kay [80]

The answer would be A) $79.20

(220*.4).9 as 60 percent off means that the product is only 40 percent of its original value, furthermore, we multiply the entire thing by .9


8 0
3 years ago
Is .3333333333333 a rational number??
natali 33 [55]

Answer: No

Step-by-step explanation: Because it is.

8 0
3 years ago
Read 2 more answers
Which answer is the approximate standard deviation of the data set?
Anna35 [415]

Answer:

3.4

Step-by-step explanation:

Standard deviation of a population is defined as:

σ² = ∑(xᵢ − μ)² / n

The standard deviation of a sample is defined as:

s² = ∑(xᵢ − x)² / (n - 1)

It's not clear which one we have, so let's calculate both.

First, we must find the mean.

μ = (5+12+15+10+12+6+8+8) / 8

μ = 9.5

Now we find the squares of the differences:

(5-9.5)² + (12-9.5)² + (15-9.5)² + (10-9.5)² + (12-9.5)² + (6-9.5)² + (8-9.5)² + (8-9.5)²

= 80

Divide by n:

σ² = 80 / 8

σ² = 10

And take the square root:

σ = √10

σ ≈ 3.2

That's not one of the answers, so let's try the standard deviation of a sample instead of a population.

Instead of dividing by n, we'll divide by n-1:

s² = 80 / 7

And take the square root:

s = √(80/7)

s ≈ 3.4

So that must be it.

6 0
3 years ago
Marty’s dog can run 3 miles in 20 minutes. What is the dog’s speed in miles per hour?
stich3 [128]
9mph because 20 minutes time 3 is one hour so multiply 3 by 3 to get 9
7 0
3 years ago
Read 2 more answers
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