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Firlakuza [10]
3 years ago
10

Combine like terms. (7+x)(7-x)

Mathematics
1 answer:
aleksandrvk [35]3 years ago
8 0

Answer:

x^2-49

Step-by-step explanation:

when u multiply the numbers in parenthesis u get 49-7x+7x-x^2 and when u simplify that u get x^2-49

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Pipe A can fill 3 tanks in 8 minutes. Pipe B can fill 5 tanks in 10 minutes. How long will it take for them to fill a single tan
Nata [24]

Answer:

c =4 4/9 minutes

Step-by-step explanation:

The formula is

1/a + 1/b = 1/c  where a and b is the time for each working alone and c is the time working together

1/8 + 1/10 = 1/c

Multiply by 40c to clear the fractions  ( 40c is the least common multiple)

40c(1/8 + 1/10 = 1/c)

5c + 4c = 40)

9c = 40

Divide by 9

9c/9 = 40/9

c =4 4/9 minutes

3 0
3 years ago
An arts academy requires there to be 5 teachers for every 125 students and 4 tutors for every 88 students. How many students doe
nikitadnepr [17]

Answer:

25 students peer teacher, 22 students per tutor, 4 tutors for 81 students

Step-by-step explanation:

You need to find the unit rate,

for the teachers, to find the unit rate would be 125 divided by 5. For tutors it would be 88 divided by 4.

Then to find how many tutors you need for 81 students you would need 4 tutors because you want to divide 81 by the unit rate we got (22), and since the answer would be a decimal (3.68.....) you would need to round the whole number up to four because you cant have a decimal of a person.

3 0
3 years ago
8. A car dealer buys a luxury car for $45,800, and sells it for $61,830. Find the percent of change.
Ilia_Sergeevich [38]
Answer B
Explanation cuz



6 0
3 years ago
Read 2 more answers
1/6 / 1 2/3 divide fraction to simplest form
stepladder [879]

Answer:

1/10

Step-by-step explanation:

1/6 / 1 2/3

Convert 1 2/3 to 5/3.

1/6 / 5/3

1/6 x 3/5

3/30 or 1/10

8 0
3 years ago
The table includes the cost of ordering different numbers of fence sections. Number of Sections (x) Cost in Dollars (y) 10 409 5
xenn [34]
200 sections will cost $7439.

We first see if the rate of change, the slope, is the same between data points.  If it is, the function will be linear.  We use the formula

m = (y₂ - y₁)/(x₂ - x₁)

For the first two data points, we have

m = (1889-409)/(50-10) = 1480/40 = 37

For the second two data points, we have

m = (4664-1889)/(125-50) = 2775/75 = 37

Now that we know the slope is the same, we can write the equation:
y - y₁ = m(x - x₁) 
y - 409 = 37(x - 10)
y - 409 = 37x - 370

Add 409 to both sides: 
y = 37x + 39

Using 200 as x,
y = 37(200) + 39 = 7439
3 0
4 years ago
Read 2 more answers
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