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lara31 [8.8K]
4 years ago
8

Hi i need help with this problem, its due Monday

Mathematics
1 answer:
Serga [27]4 years ago
8 0

The answer is B. 7x + 27 units.

Area is length multiplied by width, so to find the length, simply divide the expression 21x + 81 by the width --> 3.

21x becomes 7x, and 81 becomes 27.

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Jeffrey says he has 6.8 dollars. How do you write the decimal 6.8 when it refers to money? Explain
katen-ka-za [31]

Answer:

$6.80, dollar and cent amounts are always written to two decimal places.

7 0
4 years ago
B divided by 8 equals 21
ollegr [7]

Answer:

what

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
I need help please.
Marat540 [252]

Answer:

7-x

This is because 7 itself is decreased by a number, if for e.g that number was 5, the expression would mean 7-5= 2

5 0
3 years ago
Un comerciante de algodón de azúcar gana 40 cm por cada algodón vendido pero si no lo logra venderlo pierde 50 céntimos. un día
gayaneshka [121]

Answer:

He fails to sell that day 10 cottons.

Step-by-step explanation:

We are given that a cotton candy merchant earns 40 cents for each cotton sold, but if he cannot sell it he loses 50 cents.

One day when he made 120 cottons, he made a profit of 39 soles.

Let the number of cottons merchant is able to sold be 'x' and the number of cottons merchant is not able to sold be 'y'.

So, according to the question;

  • The first condition states that he made 120 cottons on one day, that is;

                                   x + y = 120

                                   x = 120 - y    ---------------------- [Equation 1]

  • The second condition states that merchant earns 40 cents for each cotton sold, but if he cannot sell it he loses 50 cents and due to which he made a profit of 30 soles, that is;

                               0.40x - 0.50y=39

                               40x - 50y=3900

                               40(120-y) - 50y=3900  

                               4800-40y - 50y=3900

                               90y=4800-3900

                                90 y = 900

                                  y=\frac{900}{90}=10

This means that the merchant is not able to sell 10 cottons.

4 0
3 years ago
A hypothetical cube grows so that the length of its sides are increasing at a rate of 2 m/min. How fast is the volume of the cub
Karolina [17]

Answer:

In a min the volume increased by 296m^3

Step-by-step explanation:

Volume of cube = v^3

At 8m = V = 8*8*8 = 512

Since it's growing at 2m/min

The previous volume A min ago would have been

8m - 2m = 6m

V = 6*6*6 = 216

So in a minute, the volume had gone from 216 to 512

The speed = 512 - 216 = 296

So it's volume increased by 296 in a min.

Just for future clarification.

(2 min ago the volume would have been.

8m - (2*2)m = 4

V 2min ago = 4*4*4 = 64.

At 2mins ago the volume changed by 216 - 64 = 152.

So this is what the volume looked like Each minute

0, 8, 64, 216, 512, 1000.)

3 0
3 years ago
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