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2 years ago

I need help for all of these please

Mathematics

1 answer:

Oliga [24]2 years ago

4 0

Answer:

(What is the full question?)

Step-by-step explanation:

Note:

1. If line a is parallel to b, slope a = slope b;

2. If line a is perpendicular to b, slope a * slope b = -1

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Please help! What is the division problem represented by this model?

Cerrena [4.2K]

Answer:

the answer is 42/100

42 blocks are shaded out of 100

3 0

3 years ago

5,000 people visited a book fair in the first week. The number of visitors decreased by 12.5% in the second week. How many peopl

julsineya [31]

Answer:

<u>4,375</u> people visited the book fair in the second week.

Step-by-step explanation:

1) 5,000 x 0.125 = 625

2) 5,000 - 625 = 4,375

7 0

3 years ago

Which of the following sums would be under the radical symbol to find the distance between the points (7, -1) and (-8, -9)?

Alex

So the distance formula is $\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$ . Using this, our equation is $\sqrt{(7-(-8))^2+(-1-(-9))^2}$ and we can solve for it as such:

$\sqrt{(7-(-8))^2+(-1-(-9))^2}\\ \sqrt{15^2+8^2}$

As we see with this radical, the sum that's under it is 15^2 + 8^2, or the third option.

7 0

3 years ago

I NEED HELP PLEASE, THANKS!

Finger [1]

Answer:

the 3rd option is the answer

Step-by-step explanation:

I hope the attached file is self-explanatory

3 0

3 years ago

A human brain weighs about 1 kg and contains about 1011 cells. Assuming that each cell is completely filled with water (density

elena-s [515]

Answer:

Step-by-step explanation:

From the information given:

a human brain weighs = 1 kg ; = 1000 grams

Number of cells = 10¹¹ cells

The density of water filled in each cell = 1 g/mL

From above;

the weight of each of the brain cell = total weight of the human brain/the number of cells

the weight of each of the brain cell = 1000/10¹¹

the weight of each of the brain cell = 1 × 10⁻⁸ grams

Now, to calculate the quantity of water in each cell; we have:

= the weight of each brain × density

= $1 \times 10^{-8} \ g \times \dfrac{1 \ mL}{1 \ g}= 1 \times 10^{-8} \ mL$

For cube; we know that

1 mL = 1 cm³

Thus:

$1 \times 10^{-8} \ mL= 1 \times 10^{-8} \ cm^3$

Recall that; the volume of a cube as well = $x^3$

where;

x = length of each sides

∴

$x^3$ = $1 \times 10^{-8} \ cm^3$

$x = \sqrt[3]{1 \times 10^{-8}}$

x = 0.0022 cm

Thus, the length of each side of the cell = 0.0022 cm

The surface area of a single cell = x²

The surface area of a single cell = (0.0022 cm)²

The surface area of a single cell = 4.84 × 10⁻⁶ cm²

Therefore, the total surface area of is:

$1 \times 10^{11} \ cells \times \dfrac{4.84 * 10^{-6} \ cm^2}{1 \ cell}$

= $4.84 \times 10^5 cm^2$

= $5.0\times 10^5 cm^2$

= 50 m²

7 0

4 years ago