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mixer [17]
3 years ago
10

What is bigger, 40% of 90, 1/2 of 80?

Mathematics
1 answer:
MArishka [77]3 years ago
5 0
1/2 of 80 because 40% of 90 i only 36. 
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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
The axis of symmetry for the graph of the function f(x) =
lara [203]

Answer:

12

Step-by-step explanation:

y =  - x {}^{2}  + bx + 10 \\ y =  - (x {}^{2}  - bx - 10) \\ y =  -( (x -  \frac{b}{2} ) {}^{2}  -  \frac{b {}^{2} }{4}  - 10) \\ y =  - (x -  \frac{b}{2} ) {}^{2}  + 10 +  \frac{b {}^{2} }{4}  \\  \\ therefore \:  \frac{b}{2}  = 6 \\ b = 12

7 0
3 years ago
This is a picture of a cube and the net for the cube.
Nataliya [291]

Answer:

1196 mm^2

Step-by-step explanation:

That's really well described. All in all you have 6 squares all laid out flat. Each square has a side of 14 mm.

The area of 1 square = 14mm * 14mm = 196 mm^2

The area of 6 squares = 6 * 196 mm^2 = 1176 mm^2

3 0
3 years ago
Can someone please help me solve this problem
ololo11 [35]

Answer:

3

Step-by-step explanation:

substitute -2 in where y is.

the subtraction sign in front of the 3 makes it negative so -3 x -2 is positive 6.

4x+6=18, subtract 6 on both sides.

4x=12

divide 4 on each side.

×=3

3 0
3 years ago
Find the equation of a line glven the point and slope below. Arrange your answer in the form y = mx + b, where b is the
Greeley [361]

Answer:

b=-79

Step-by-step explanation:

(10,11) means x=10,y=11

m=9 b=?

y=mx+b

Make b the subject of formula

b=y-mx

b=11-9(10)

b=11-90

b=-79

4 0
3 years ago
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