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3 years ago

7x=42

Mathematics

2 answers:

Airida [17]3 years ago

5 0

Answer:

Step-by-step explanation:

Naily [24]3 years ago

4 0

Answer:

Step-by-step explanation:

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Nancy has a freshwater aquarium at home. She buys goldfish four more than twice the number of platies she bought last Sunday. Sh

Rama09 [41]

Answer:

Step-by-step explanation:

Let's assume that Nancy bought 'p' numbers of platies. The question says, she buys goldfish, 4 more than twice the number of platies.

So, 4 more than twice of 'p' can be written as,

$2p+4$ that is the number of goldfish she bought. Let 'g' represent the number of goldfish. So we have,

$g=2p+4$

She also buys 2 black mollies and a few guppies that amounted to one quarter of the total number of goldfish she bought. Let 'x' represent the number of guppies, so we have,

$x= \frac{1}{4} (2p+4)$

Altogether she has 35 fish, so the sum of all the fishes should be 35,

$p+ (2p+4)+2+\frac{1}{4} (2p+4)=35$

multiplying both the sides of the equation by 4, we get,

$4p+4(2p+4)+8+(2p+4)=140$

$4p+8p+16+8+2p+4=140$

$14p+28=140$

$14p=140-28$

$14p=112$

$p=\frac{112}{14} =8$

Hence, Nancy bought 8 platies. Now that we know the number of platies, we can find the number of goldfish that she bought.

We know that she bought (2p+4) number of goldfish, putting the value of 'p', we get,

$G= (2 \times 8 + 4)= 16+4=20$

Hence, Nancy bought 20 goldfish for her aquarium.

3 0

3 years ago

Read 2 more answers

Una limusina cuesta $ 85 para alquilar por 3 horas más un 7% de impuesto sobre las ventas. Cúal es el costo total

Sati [7]

Answer:

$181.9

Step-by-step explanation:

Si cuesta 85 dólares por 3 horas, queremos duplicarlo para obtener la cantidad por 6 horas, que es 170 dólares. Esto es antes del impuesto a las ventas. Puede encontrar la cantidad después del impuesto a las ventas multiplicando 170 por 1.07. Hace esto porque el 100 por ciento del costo sería 170 por 1 y el 7 por ciento es .07, por lo que si desea el 107 por ciento del costo, debe hacerlo 170 por 1.07. Esto funciona porque toma el 7 por ciento de 170 y lo agrega al costo total. También puede hacer esto 170 veces .07. Luego suma el producto a 170. 181,9 es la respuesta final.

English- If it costs 85 dollars for 3 hours we want to double that to get the amount for 6 hours which is 170 dollars. This is before sales tax. You can find the amount after sales tax by multiplying 170 by 1.07. You do this because 100 percent of the cost would be 170 times 1, and 7 percent is .07, so if you want 107 percent of the cost you want to do 170 times 1.07. This works because it takes 7 percent of 170 and adds it to the total cost. You could also do this by 170 times .07. Then add the product to 170. 181.9 is the final answer.

5 0

2 years ago

Please help me with this!

mezya [45]

Answer:

$y = \frac{6 - r}{r - m}$

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7 0

3 years ago

What is the slope of the following linear equation y + 2x = 5 ?

Arte-miy333 [17]

Answer:

slope = -2

Step-by-step explanation:

The general structure of an equation in slope-intercept form is:

y = mx + b

In this form, "m" represents the slope and "b" represents the y-intercept. Since the given equation is not in the exact slope-intercept form, we need to rearrange it to identify the slope.

y + 2x = 5 <----- Given equation

y = -2x + 5 <----- Subtract 2x from both sides

Now, we can see that in the "m" position, there is a value of -2. This makes the slope = -2.

4 0

2 years ago

Is 7n equivalent to 15n-8n

Lemur [1.5K]

Answer:

Yes.

Step-by-step explanation:

Yes. When we simplify 15n-8n, it equals 7n.

5 0

2 years ago