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2 years ago

15

The floor of a restaurant is a square of sides 28 cm. The floor covered with square tiles of sides 40 cm. Calculate the total nu

mber of tiled used.

1 answer:

andrew11 [14]2 years ago

5 0

Answer:

I'm going to calculate with sides 28 m

4,900 tiles used

Step-by-step explanation:

Area restaurant 28x28 = 784 m squared

each tile 40 cm = 0.4m

area of tile 0.4x0.4 =0.16

784/0.16 = 4,900

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sammy [17]

The first missing quantity is force due to gravity, and it is 215.1 N.

The second missing quantity is distance between the statellite and the Earth, determined as 6,000 km.

<h3>Force between two masses</h3>

The force between two masses is determined by applying Newton's law of universal gravitation as shown below;

$F = \frac{GMm}{R^2}$

where;

M is mass of Earth = 5.97 x 10²⁴ kg
m is mass of the satellite
R is the distance between the satellite and the Earth
G is universal gravitation constant

<h3>First missing quantity</h3>

The first missing quantity is force due to gravity, and it is calculated as follows;

$F = \frac{(6.67 \times 10^{-11} ) \times (5.97 \times 10^{24}) \times (700)}{(36,000 \times 10^3)^2} \\\\F = 215.1 \ N$

<h3>Second missing quantity</h3>

The second missing quantity is distance between the statellite and the Earth,

$R^2 = \frac{GMm}{F} \\\\R^2 = \frac{(6.67 \times 10^{-11})(5.97 \times 10^{24})(1000)}{11,000} \\\\R^2 = 3.62 \times 10^{13}\\\\R = 6,000 \ km$

Learn more about Newton's law here: brainly.com/question/3999427

6 0

2 years ago

A method for assessing age-related changes that combines the cross-sectional and longitudinal approaches by observing a cross se

MrRissso [65]

Answer:

a. mixed longitudinal study

True, by definition a mixed-longitudinal study is when "have defined some cohorts and these are followed for a shorter period and we can compare the precision, bias due to age and cohort effects" on the entire study. So that represent the perfect mix between longitudinal and cross sectional study.

Step-by-step explanation:

a. mixed longitudinal study

True, by definition a mixed-longitudinal study is when "have defined some cohorts and these are followed for a shorter period and we can compare the precision, bias due to age and cohort effects" on the entire study. So that represent the perfect mix between longitudinal and cross sectional study.

b. limited longitudinal study

This definition is not appropiate and is not usually used in the experimental designs.

c. longitudinal study

False, a longitudinal study is a design on which have "repeated observations of the same variables over short or long periods of time" and for this case we need cross sectional conditions, so for this case not applies.

d. cohort study

False, by definition a cohort study is an extesion of the longitudinal design but on this case " the samples are obtained from a cohort using cross-section intervals through time" and for this reason not applies for our case since we need a longitudinal design combined with the cross sectional design

5 0

2 years ago

4748.35 - 22.5x > 4700

Gre4nikov [31]

Answer:

x < -2.15

Step-by-step explanation:

Solve:

4748.35 - 22.5x > 4700

Subtract 4748.35 on both sides:

4748.35 - 22.5x > 4700

-4748.35 -4748.35

-22.5x > -48.35

Divide by -22.5 on both sides:

*Remember to flip the sign because you are dividing by a negative number*

-22.5x > -48.35

/-22.5 /-22.5

x < -2.148...

Round to the nearest hundredth:

x < -2.148...

x < -2.15

4 0

3 years ago

Find the value of x .

Stels [109]

Answer:

4x+2x=90

6x=90

x=15

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

12-packs of Skwunch apple juice cost $3.00 after a 40% discount. Which equation would allow you to find the original price of th

GaryK [48]

Let x be the original price.

Discount percentage = 40%

Price after discount = $3

So, x - $\frac{40}{100} x$ = 3

$\frac{100x-40x}{100}$ = 3

$\frac{60x}{100}$ = 3

$x = 3(\frac{100}{60} )$

$x=\frac{100}{20}$

x = 5

Hence, the equation that would allow us to find the original price is 0.6x = 3.

6 0

3 years ago

Read 2 more answers