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sveta [45]
3 years ago
6

A bookmark is shaped like a rectangle with a semicircle attached at both ends. The rectangle is 19 cm long and 4 cm wide. The di

ameter of each circle is the width of the rectangle. What is the area of the bookmark? Use 3.14 for π.
Mathematics
1 answer:
alexira [117]3 years ago
8 0

Answer:

Since we have two semi-circles we can say that we have a full circle. using the circle area formula we can say that

3.14*2^2 = 12.56 cm

Using the rectangle area formula we can say that

19*4 = 76 cm

Adding them both together is

12.56 + 76 = 88.56 cm

So the bookmark has an area of 88.56cm^2

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4. [4 pts] For any non-zero number a, one can explain why aº = 1 by the rules of exponents.
ozzi

Due to length restrictions, we kindly invite to read the explanation of this question to learn more on power properties.

<h3>How to understand power properties</h3>

Herein we must explain some properties of power expressions with integer exponents. A power of the form aᵇ is a product of the form a × a ×  a × a × ... × a, where a is repeated b times. a and b are the base and the exponent of the power.

First, we proceed to demonstrate that a⁰ = a:

a⁰            Given

a¹ ⁻ ¹        Existence of the additive inverse / Modulative property

a¹ · a⁻¹     Multiplication of powers of equal base

a¹ · (a¹)⁻¹   Power of a power / (- a) · b = - a · b

1               Existence of multiplicative inverse / Modulative property / Result

By definition of power, we find that a¹ as a is only only time.

To learn more on power properties: brainly.com/question/2499975

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6 0
2 years ago
Find the greatest common factor of the terms in the following expression: 30xy + 15xyz.
myrzilka [38]

Answer:

The answer is 15xy

Step-by-step explanation:

5 0
4 years ago
Read 2 more answers
un hotel tiene habitaciones dobles y sencillas. dispone en total de 50 habitaciones y 87 camas ¿cuántas habitaciones tiene cada
Alex777 [14]

Answer:

En el hotel hay 13 habitaciones sencillas y 37 habitaciones dobles.

Step-by-step explanation:

Un sistema de ecuaciones lineales es un conjunto de dos o más ecuaciones de primer grado, en el cual se relacionan dos o más incógnitas.

Resolver un sistema de ecuaciones consiste en encontrar el valor de cada incógnita para que se cumplan todas las ecuaciones del sistema.

En este caso, las variables que se definen son:

  • x: habitaciones simples
  • y: habitaciones dobles

Entonces, el hotel dispone en total de 50 habitaciones, por lo que se plantea la ecuación:

x + y= 50

El hotel dispone de 87 camas. La cantidad de camas por habitación puede ser expresada mediante:

x + 2*y= 87

Entonces el sistema de ecuaciones a resolver es:

\left \{ {{x+y=50} \atop {x+2*y=87}} \right.

El método de sustitución consiste en despejar o aislar una de las incógnitas, por ejemplo x , y sustituir su expresión en la otra ecuación. De este modo, obtienes una ecuación de primer grado con la otra incógnita,  y . Una vez resuelta, calculas el valor de  x  sustituyendo el valor de  y ya conocido.

En este caso, despejando x de la primer ecuación:

x= 50 -y

y reemplazando en la segunda ecuación obtienes:

50 -y + 2*y=87

-y + 2*y=87 -50

y= 37

Reemplazando en la expresión x= 50 -y obtienes:

x= 50 -37= 50-37

x= 13

Recordando que x representa la cantidad de habitaciones sencillas e y la cantidad de habitaciones dobles, <u><em>en el hotel hay 13 habitaciones sencillas y 37 habitaciones dobles.</em></u>

3 0
3 years ago
SOMEONE PLEASE HELP ME PLEASEEEEEE PLEASEEE!!!
Zina [86]

Answer:

18-15

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Answers<br> A. 5<br> B. 9<br> C. 11<br> D. 13
MA_775_DIABLO [31]
4k-7=2k+3
-2k. -2k

2k-7=3
+7. +7
2k=10
2÷2 2÷10
k=5

4(5)-7=13

Answer D
5 0
4 years ago
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