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sleet_krkn [62]
4 years ago
7

Suppose Tatiyana is interested in the relationship between language ability and time spent reading. She randomly selects a sampl

e of 30 students from the local high school and collects their scores from a language aptitude test. She surveys the sample asking each student how many hours per month he or she spends reading.
Mathematics
1 answer:
TiliK225 [7]4 years ago
8 0

Answer:

Given that, \hat{y} = 3.251x + 31.237 .

Thus, when, reading hours, x = 35,

\hat{y} = (3.251 * 35) + 31.237 = 145.022. (Ans).

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9x^2-y^2 in factored form
Keith_Richards [23]

Answer:

(3a-y)(3a+y)

Step-by-step explanation:

This is a difference of squares that has the form and factors to:

a^2x^2-b^2 = (ax-b)(ax+b)

Here take the square root of each term for the factors.

9a^2-y^2 = (3a-y)(3a+y)

8 0
3 years ago
29.
Elis [28]

Answer:

Sum of their present ages  = 20 years

Step-by-step explanation:

Present age :

   Neha's age = x years

Reemas' age = x - 4

After 5 years:

       Neha's age = (x +5) years

       Reemas' age = (x - 4 + 5 ) = x + 1

Sum of the ages of Reema and Neha will be 30

Therefore,    

x + 5  + x + 1 = 30

x + x + 5 + 1 = 30

   2x +  6    = 30

            2x = 30 - 6

           2x = 24

             x = 24/2

            x = 12

Neha's age = 12 years

Reema's age = 12 - 4 = 8 years

Sum of their present ages = 12 + 8 = 20 years

4 0
3 years ago
Alan has twice as many dimes as he has quarters and 10 more nickels than dimes. The remaining 35 coins are pennies. How many of
zaharov [31]

Answer:

He has 3 quarters , 6 dimes and 16 nickles

Step-by-step explanation:

∵ Dimes is d , Quarter is q , nickels is n and pennies is p

∵ Quarter = 25 cents

∵ Dime = 10 cents

∵ Nickle = 5 cents

∵ Penny = 1 cent

∵ The remaining 35 coins are pennies ⇒ 35 cents

∵ He has $2.50 = 2.50 × 100 = 250 cents

∴ The value of quarters , dimes and nickels = 250 - 35 = 215 cents

∴ 25q + 10d + 5n = 215 ⇒ (1)

∵ d = 2q  

∴ q = 1/2d ⇒ (2)

∵ n = 10 + d ⇒ (3)

Substitute (2) and (3) in (1)

∴ 25(1/2 d) + 10d + 5(10 + d) = 215

∴ 12.5d + 10d + 50 + 5d = 215

∴ 27.5d = 215 - 50

∴ 27.5d = 165

∴ d = 165 ÷ 27.5

∴ d = 6

∴ q = 1/2 (6) = 3

∴ n = 10 + 6 = 16

∴ He has 3 quarters , 6 dimes and 16 nickles

7 0
3 years ago
Read 2 more answers
Help, please Ill mark brainliest!
aev [14]

Answer:

the answers are 12.5, 5, 2, 0.8 and 0.32

Step-by-step explanation:

2(0.4)^-2

=2(6.25)

= 12.5

2(0.4)^-1

= 2(2.5)

=5

2(0.4)^0

=2(1)

=2

2(0.4)^1

=2(0.4)

=0.8

2(0.4)^2

=2(0.16)

=0.32

4 0
3 years ago
Graph the system of equations on your graph paper to answer the question.
Semenov [28]

Answer:

(-1,4) This is the solution for the given system

Step-by-step explanation:

The first graph is shown in the first picture attached, it has the points (3,0) and (0,3)

The other graph is attached as well

The solution for this system is the interception between the graph

6 0
4 years ago
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