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Fantom [35]
4 years ago
6

Write a word problem that involves combining three equal groups

Mathematics
1 answer:
Artist 52 [7]4 years ago
8 0
There are 6 pencils in each pencil box. There are 3 pencil boxes. How many pencils are there in total?
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Calcular cuántos números impares hay entre 20 y 50 y calcular su suma​
const2013 [10]

Answer:

<em>La suma de los impares entre 20 y 50 da 875</em>

Step-by-step explanation:

<u>Suma de Progresiones Artiméticas </u>

Una progresión aritmética es aquella en la cual, cada término se obtiene como el anterior mas una cantidad fija llamada diferencia común. El término general de una progresión aritmética es

a_n=a_1+(n-1)r

Donde a_1 es el primer término, n el número de términos y r la diferencia común o radio. La suma de los primeros n términos se calcula como:

\displaystyle S_n=n\frac{a_1+a_n}{2}

En nuestro ejercicio, se deben sumar los números impares entre 20 y 50, se forma la progresión

21, 23, 25, 27, ....49

Sabemos que a_1=21,\ a_n=49,\ r=2

Primero averiguamos cuántos términos son, despejando n del término general

\displaystyle n=\frac{a_n-a_1}{r}+1

\displaystyle n=\frac{49-21}{2}+1

\displaystyle n=25

La progresión tiene 25 términos

Ahora la suma es

\displaystyle S_{25}=25\frac{21+49}{2}

\displaystyle S_{25}=25\frac{70}{2}

S_{25}=875

La suma de los impares entre 20 y 50 da 875

6 0
4 years ago
HELP ANSWER BOTH PLEASE (╥﹏╥)​
pogonyaev

Answer:

a.) 61 square feet

b.) $152.50

Step-by-step explanation:

first you find the area for the rectangle

LxW=A

10x4=40

then you find the area for the triangle

(bxh)1/2=a

(6x7)1/2=21

-we get 7 from adding the height that we know (3ft) and using logic, a rectangle has equal parallel lines so the dotted line has to equal 4ft. so 3ft+4ft=7ft

then you add both areas together

40 square feet+21 square feet= 61 square feet

<em>Now</em><em> </em><em>for</em><em> </em><em>B</em><em>.</em><em>)</em>

as we know, the area of the room floor is 61sq feet. so by multiplying 2.5 and 61 you get the cost as $152.50

8 0
4 years ago
Blank tens 15 ones = 6 tens 5 ones
IrinaK [193]
5 is the answer................
8 0
3 years ago
Read 2 more answers
Describe the number of faces and thier shapes
Marysya12 [62]
Do you have pictures
3 0
4 years ago
A machine packs boxes at a constant rate of 2/3 of a box every 1/2 minute. What is the number of boxes per minute that the machi
larisa [96]
2/3 box  per 1/2 minute => 2(2/3) box per 2(1/2) minute 

Thus it is 4/3 box per minute
5 0
4 years ago
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