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aalyn [17]
3 years ago
8

4

Mathematics
1 answer:
Vlad1618 [11]3 years ago
8 0
She is right.
30+20=50. they’re estimating so it will not be far off.
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Which quadratic regression equation best fits the data set?
nata0808 [166]

Answer: y = 1.87x^2 -5.16 x + 10.54

Step-by-step explanation:

Since the general quadratic equation is,

y = ax^2 + bx+c

Here the given table is,

x           1             2              3            4               5              6             7

y          5.9        8.9          13.4         20.1          30.1         45.1        67.7

By the graphing calculator,

a = 1.87024 ≈ 1.87

b= -5.15833 ≈ -5.15

c = 10.5429 ≈ 10.54

By putting the values of a, b and c,

The required quadratic equation is,

1.87 x^2 -5.15x + 10.54

⇒ First Option is correct.

6 0
4 years ago
Read 2 more answers
36 is what percent of 120
Dafna1 [17]


x%*120=36

x/100 *120=36

120x/100=36

120x=3600      <em>/:120</em>

<em>x=30</em>

<em>⇒36 is 30% of 120 </em>

<em />


6 0
4 years ago
Read 2 more answers
Pam is a wedding planner She is setting up a room to seat at least 100 guests. She has some tables that seat 10 people and some
ANTONII [103]

Answer:

1. 10x + 5y ≥ 100

2. y ≤ 10

3 0
3 years ago
Find the number of positive numbers less than 2020, which can not be written as the sum of six consecutive positive numbers.
sveta [45]

Answer: 334

Step-by-step explanation:

6 consecutive numbers can be written as:

n, n+1, n+2, n + 3, n + 4, n + 5,

The addition of those 6 numbers is:

n + n+1 + n+2 + n + 3 + n + 4 + n + 5

6n + 1 + 2 + 3 + 4 + 5 = 6n + 15

Let's find the maximum n possible:

6n + 15 = 2020

6n = 2020 - 15 = 2005

n = 2005/6 = 334.16

The fact that n is a rational number means that 2020 is can not be constructed by adding six consecutive numbers, but we know that with n = 334 we can find a number that is smaller than 2020, and with n = 335 we can found a number bigger than 2020.

So with n =  334 we can find one smaller.

6*334 + 15 = 2019

and we can do this for all the values of n between 1 and 334, this means that we have 334 numbers less than 2020 that can be written as a sum of six consecutive positive numbers.

8 0
3 years ago
If gasoline costs $3.92 per gallon, and filling up a car’s tank costs $49.00, how many gallons does the tank hold?__________ gal
Nataliya [291]

Answer:

12.5

Step-by-step explanation:

49.00/3.92=12.5

3 0
4 years ago
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