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NISA [10]
3 years ago
7

A researcher posts a magazine advertisement offering $24 in exchange for participation in a short study. The researcher accepts

the first six people who respond to the advertisement. Which of the following statements is true about the sample?
A. It is not a valid sample because it is not a random sample of the population.
B. It is a valid sample because the first six people were selected to participate.
C. It is a valid sample because money was offered to participants.
D. It is not a valid sample because it is only a short study.
Mathematics
1 answer:
Vinil7 [7]3 years ago
5 0
The correct answer is a
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-3x + 3y =3<br> -5x + y =13 Solve as a whole number
anzhelika [568]

Answer:

X = 3 x − 14

y = − x + 5

Step-by-step explanation:

Solve for the first variable, then substitute the result into the other equation.

4 0
2 years ago
Read 2 more answers
What number do these base ten blocks show
nasty-shy [4]
70 should be correct
5 0
3 years ago
Graph the exponential model y = 3(6)x .Which point lies on the graph?
leonid [27]

Answer:

<em>0</em>

Step-by-step explanation:

y = 3 × 6x

0 = 3 × 6x

0 = 18x

18x = 0

<em>x = 0</em>

<em></em>

<em>Hope this helps! :)</em>

3 0
4 years ago
How tall is a building that casts a 73 foot shadow when the angle of elevation of the sun is 29
Ilya [14]
We use trigonometry for this problem. You might have learned about SOH CAH TOA. In right triangles, when given an angle, you can name the three sides of the triangle a certain part: Opposite, Adjacent, and Hypotenuse.

For this problem, we are given the angle and the ADJACENT length (73). We want to find the OPPOSITE side's length.
TOA
We must use the tangent function.

TOA helps us remember this relationship:
tan( theta ) = opposite / adjacent.

Plug in our values:

tan(29 degrees) = opposite / 73

Multiply by 73 to isolate "opposite" and solve for it.

73 * tan(29) = opposite.

Using a calculator, the answer is approximately 40.46 ft.

7 0
3 years ago
Replace the * with a monomial so that the trinomial may be represented by a square of a binomial:
pogonyaev

Answer:

Below in bold.

Step-by-step explanation:

The identity is of the form

(a + b)^2 = a^2 + 2ab + b^2.

a) Sqrt 49 = 7 and we need + 28 as the middle coefficient . We get this with

2*7 + 2*7 so the first coefficient is 2*2 = 4.

So * = 4a^2.

(2a + 7)^2 = (2a + 7)(2a + 7) = 4x^2 + 14a + 14a + 49.

b) -6 * -6 = 36   -24 =  2*-6 + 2 *-6 so the last term is 4x^2

c) The middle term  must be an 'ab' term.

sqrt 6.25 = 2.5 and sqrt 1/4 = 1/2

So the coefficient of the middle term is 2.5 * 1/2 + 2.5 * 1/2

= 2.5

So the middle term is 2.5ab.

d) The first term will be in b^2.

100 = 10* 10 and we need 2 as a middle term so coefficient of the first term

will be  1/100 or 0.01.  as the 2 comes from 0.1 * 10 + 0.01 * 10 and (0.1)^2 = 0.01

So it is 0.01b^2.

8 0
3 years ago
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