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3 years ago

Can anyone help me with these?

Mathematics

1 answer:

katrin2010 [14]3 years ago

6 0

Answer:

Step-by-step explanation:

Distributive property: a*(b + c) = ab + ac

16)5x²(7 - x²) = 5x²*7 - 5x²*x²

=35x² - 5x⁴

17)

10x(4 - 3x) = 10x*4 - 10x*3x

= 40x - 30x²

18) 9( y +4) = 9*y + 9*4

= 9y + 36

19) 3(4 - x) - 3(2 - x) = 3*4 - 3*x -3*2 - x*(-3)

= 12 - 3x - 6 + 3x {add/subtract like terms}

= 12 - 6 - 3x + 3x

= 6

20) 6y + 6(y - 4) = 6y + 6*y - 6*4

= 6y + 6y - 24

= 12y - 24

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A team is excavating an archeological site. The original plan was to excavate a rectangular area 35 ft long

nikitadnepr [17]

Answer:

Part 1) The length of the new rectangle is $87.5\ ft$

Part 2) The area of the new rectangle is $4,375\ ft^{2}$

Step-by-step explanation:

we know that

If two rectangles are similar, then the ratio of its corresponding sides is proportional

step 1

Find the length of the new rectangle

Let

L-----> the length of the new rectangle

$\frac{50}{20}=\frac{L}{35}\\ \\ L=50*35/20\\ \\L=87.5\ ft$

step 2

Find the area of the new rectangle

we know that

The area of the rectangle is

$A=LW$

we have

$L=87.5\ ft$

$W=50\ ft$

substitute

$A=(87.5)(50)=4,375\ ft^{2}$

3 0

3 years ago

Please help answer this question I’m just stupid

kykrilka [37]

1500
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It starts at 1500 and then after one hour
It go up to 2,100 then 2700

8 0

2 years ago

Read 2 more answers

A survey is being conducted to decide on how much time people spend watching sports on television. Tell whether the given sample

Naddika [18.5K]

Sampling bias occurs when some members of a population are systematically more likely to be selected in a sample than others. From this definition,

For sample 1, Every fifth person who enters Little Casesars Arena for a Red Wings game. This is not biased because no person is more likely to be selected than another

For sample 2, Every tenth name in the phone. This is also not biased

because no person is more likely to be selected than another

4 0

3 years ago

Find the product (2/9) x (9/5)

nevsk [136]

We can set it up like this:
$\frac{2}{9}\cdot \frac{9}{5}$
Multiply straight...
$=\frac{2\cdot \:9}{9\cdot \:5}$
Simplify...
$=\frac{2}{5}$
That's our answer, we can also convert it to decimal.

Answer in fraction form: $=\frac{2}{5}$
Answer in decimal form: $0.4$

Let me know if you have any questions regarding this problem!
Thanks!
-TetraFish

6 0

2 years ago

I need help pleace

Whitepunk [10]

Answer

length = width + 15

Area = length * width; area is 54 square feet.

Two equations are:

L = W + 15

L * W = 54

To solve, we substitute first equation into second equation:

(W + 15) * W = 54

w^2 + 15w = 54

w^2 + 15w - 54 = 0

(w+18)(w-3) = 0

w = -18 or 3

The width cannot be negative, so 3 is the width and since length is 15 more than width, length is 18:

Length = 18 feet

Width = 3 feet

7 0

2 years ago