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3 years ago

A study of sleep patterns randomly selected participants in the study to sleep in either a dark room or a room with light.

Mathematics

2 answers:

garri49 [273]3 years ago

8 0

Answer:

C. randomization

Step-by-step explanation:

We are told that the study randomly selects participants in the study to sleep in either a dark room or a room with light. This means that randomization is part of the study.

ladessa [460]3 years ago

3 0

The answer is c: randomization

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Help me to solve this please

scZoUnD [109]

Answer:

-4/9

Step-by-step explanation:

We first calculate the first bracket.

[2/3-(-4/9)]

= (2/3+4/9) (we cancel out the negatives)

= (6/9+4/9) (common denominator)

= 10/9

Then we convert -2 1/2 into an improper fraction.

-2 1/2

= -5/2

Finally we calculate the division by swapping the numerator and denominator of -5/2.

10/9 / -5/2

= 10/9 * -2/5

= -20/45

= -4/9 (simplify the terms)

3 0

2 years ago

What is the radius and the diameter of 4.2

alekssr [168]

4.2 because it has a box around the corner that makes it whole

4 0

3 years ago

2. find the value pls no links

natta225 [31]

Answer:

$\displaystyle V = 2144.66 \ ft^3$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Geometry

Volume of a Sphere Formula: $\displaystyle V = \frac{4}{3} \pi r^3$

r is radius

Step-by-step explanation:

Step 1: Define

Identify variables

r = 8 ft

Step 2: Find Volume

Substitute in variables [Volume of a Sphere Formula]: $\displaystyle V = \frac{4}{3} \pi (8 \ ft)^3$
Evaluate exponents: $\displaystyle V = \frac{4}{3} \pi (512\ ft^3)$
Multiply: $\displaystyle V = \frac{2048}{3} \pi \ ft^3$
Estimate: $\displaystyle V = 2144.66 \ ft^3$

5 0

3 years ago

What is the measure of ZB?

brilliants [131]

Answer:

∠ B = 116°

Step-by-step explanation:

The sum of the 3 angles in a triangle = 180° , that is

∠ B + 28° + 36° = 180°

∠ B + 64° = 180° ( subtract 64° from both sides )

∠ B = 116°

5 0

2 years ago

Read 2 more answers

Match the graph to one of the exponential functions .

Ipatiy [6.2K]

Answer:

The second possible answer is the correct one.

Step-by-step explanation:

The second possible answer is the correct one. As x increases, 4^x increases exponentially. However, in this case there's a negative sign in front of 4^x, so we know that the graph follows an exponential trajectory downward. Also note that 4^0 = 1, so 1 - 4^x = 0 at x = 0.

4 0

3 years ago