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valentinak56 [21]
3 years ago
11

Which expression represents: the product of 7 and the sum of 3 times a number n and 5?

Mathematics
1 answer:
Dmitrij [34]3 years ago
4 0

Answer:

7(3n+5)

Step-by-step explanation:

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Read the complete problem before answering.
melomori [17]
Its b for the second question
8 0
3 years ago
Un par de zapatos más dos pantalones valen $ 70.000 en una tienda. Se ofrece una oferta, al comprar dos o más pares de zapatos d
Sauron [17]

Answer:

49.5 $

Step-by-step explanation:

Comencemos por lo siguiente:

Si llamamos  x al precio del  par de zapatos  y  "y"  al precio de cada pantalón, entonces la tienda ofrece:

un par de zapatos   x    más dos pantalones   2*y  en  70.000 $  (deben ser 70 $ pero esa cifra no importa a los fines de resolver el problema, habrá solo que hacer el ajuste correspondiente, en lo que aqui respecta hablaremos de 70 $)

Entonces  de acuerdo a lo expuesto

x  +  2y  =  70         or    y  =  ( 70 - x) /2      (1)

Esa es la condición inicial.

Ahora bién  Juan paga por tres pantalones  38.25 $

Eso quiere decir ( como los pantalones son iguales) que pago 38.25/3 por cada pantalón

38.25/3  =  12.75 $

Ahora bién ese precio tubo una rebaja del precio original del 15 % ( quiere decir que el precio original de cada pantalón es de

12.75/0.85  =  15 $            x =  15 $

Entonces si nos vamos a la ecuación (1) (alli los precios son originales) tenemos que

y  =  ( 70  - x ) / 2       y  =  ( 70 - 15 ) / 2    y  = 55/2     y  =  27.5 $

Ahora Juan paga por dos pares de zapatos donde según las ofertas de la tienda el debera tener un descuento del 10 % en cada par

Por lo que si  un par cuesta  27.5 $  le darán un descuento del 10% es decir pagará  27.5 *0.9 =   24.75  por cada par, como son dos pares

pagará 2 * 24.75  =   49.5 $

8 0
3 years ago
Can somebody help with these two?
kotegsom [21]

Answer:

14: 104.5 square inches

15: 706.5 square inches

Step-by-step explanation:

14: 19x11= 209

209/2= 104.5 square inches

15: formula: pi times the radius squared

15x15= 225

225x3.14= 706.5 square inches

8 0
1 year ago
Ben bowled 121 and 184 in his first two games. What must he bowl in his third game to have an average of at least 170​?
vagabundo [1.1K]

Answer:

205

Step-by-step explanation:

Were gonna start by writing an equation (121+184+x)/3=170 because were adding a 3rd value to the average and x is going to be our value that were looking for. If you solve that, you get 205. Hope this helps.

6 0
3 years ago
How many solutions does the system have? y=−2x−4 y=3x+3 ​
Molodets [167]

Answer:

One Solution

Step-by-step explanation:

First substitute the y in the first equation with the second equation to get

-2x-4=3x+3

since theres a variable of both sides, you subtract the variable with the least coefficient, in this case, you add 2x to both sides to get

-4=5x+3

subtract the constant on both sides to get

-1=5x

divide both sides by 5

x= -0.2 or -1/5

4 0
3 years ago
Read 2 more answers
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