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tino4ka555 [31]
3 years ago
5

-6 < 3х + 15 <6 Pls help show all work

Mathematics
1 answer:
astraxan [27]3 years ago
5 0

Answer:

-7<x<-3

Step-by-step explanation:

separate into two inequalities:

3x+15>-6

3x+15<6

solve inequalities:

3x>-21........3x<-9

x>-7.............x<-3

-7<x<-3

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La edad de Ericka es el tripl de la edad de Liliana y hace 9 años la suma de sus edades era 22. ¿Cuantos años tiene actualmente
Gnom [1K]

Answer:

Liliana tiene 10 años.

Step-by-step explanation:

Definamos las variables:

E = edad de Ericka

L = edad de Liliana.

Primero sabemos que la edad de Ericka es el triple de la edad de Liliana, entonces:

E = 3*L

Tambien sabemos que hace 9 años la suma de sus edades era 22

Hace nueve años la edad de Ericka era E - 9

Y hace nueve años la edad de Liliana era L - 9

Entonces tenemos:

(E - 9) + (L - 9) = 22

Así, tenemos un sistema de dos ecuaciones:

E = 3*L

(E - 9) + (L - 9) = 22

Queremos conocer la edad actual de Liliana.

Para ello tenemos que despejar E en una de las ecuaciones.

Podemos ver que en la primer ecaución E ya está aislada, entonces nos saltamos ese paso.

Ahora, reemplazamos E en la otra ecuación:

(E - 9) + (L - 9) = 22

(3*L - 9) + (L - 9) = 22

Ahora podemos resolver esto para L

3*L - 9 + L - 9 = 22

4*L - 18 = 22

4*L = 22 + 18

4*L = 40

L = 40/4 = 10

L = 10

Liliana tiene 10 años.

3 0
3 years ago
Tessa earned $25.50 in 5 hours. How much did she earn per hour?
Mama L [17]

$5.10

Is you divide $25.50 by 5 you get

$5.10

7 0
4 years ago
Read 2 more answers
CAN SOMEONE HELP ME PLEASE
In-s [12.5K]

Answer: 9 x 6 x 6

Step-by-step explanation: 9 x 6=54  54 x 6 = 324 ft

4 0
3 years ago
Please help me with this I can't do it
Lelechka [254]
The base is 5x
Your hight is 3x
8 0
3 years ago
Write each ratio in simplest form<br> 64:40
Alona [7]
The largest GCF of both 64 and 40 would be 8

When you do 64/8 you get 8
When you do 40/8 you get 5

SO the final answer is 8:5

Hope this helps
8 0
4 years ago
Read 2 more answers
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