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3 years ago

Select the correct answer.

Mathematics

2 answers:

xeze [42]3 years ago

7 0

Answer:

I think it’s B. 4 because 65 divides by 15

Step-by-step explanation:

nignag [31]3 years ago

3 0

I think it’s B. 4 because 65 divides by 15

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11. Find the product: (50z + 20)(10z + 4) ( 1 ) 12. Find the product: (88a + 80)(8a + 8) ( 1 ) 13. Find the product: (40y + zy)(

Vika [28.1K]

Answer:

11. $500z^{2} +400z+80$

12. $704a^2 + 1344a + 640$

13. $160y^2 + 44zy^2 + z^2y^2$

Step-by-step explanation:

11. $(50z + 20)(10z + 4) = ?$

Using Formula:

$(a+b) (c+d) = a(c+d)+b(c+d)$

$50z(10z+4) + 20(10z + 4) = \\\Rightarrow 500z^{2} + 200 z+200z+80\\\Rightarrow 500z^{2} +400z+80$

12. $(88a + 80)(8a + 8) = ?$

Using Formula:

$(a+b) (c+d) = a(c+d)+b(c+d)$

$\Rightarrow 88a(8a+8) + 80(8a + 8)\\\Rightarrow 704a^2 + 704a + 640a + 640\\\Rightarrow 704a^2 + 1344a + 640$

13. $(40y + zy)(4y + zy) = ?$

Using Formula:

$(a+b) (c+d) = a(c+d)+b(c+d)$

$\Rightarrow 40y(4y + zy) + zy(4y + zy)\\\Rightarrow 160y^2 + 40zy^2 + 4y^2z + z^2y^2\\\Rightarrow 160y^2 + 44zy^2 + z^2y^2\\$

7 0

3 years ago

If 5 cans of soup cost $6.45, what is the cost of 8 cans of the soup?

jeyben [28]

Answer:

$10.32

Step-by-step explanation:

6.45/ 5 = 1.29

1.29 * 8 = 10.32

8 0

4 years ago

Read 2 more answers

Which number is NOT rational?

Novosadov [1.4K]

Answer:

B. $\sqrt{5}$

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Hi! Please help, I'd appreciate it!

Romashka-Z-Leto [24]

The volume of sphere is $\frac{1372}{3}\pi$ feet cubed.

Step-by-step explanation:

Given,

Surface area of sphere = 196π square feet

Surface area of sphere = 4πr²

We will find radius of sphere.

$4\pi r^2=196\pi$

Dividing both sides by 4π

$\frac{4\pi r^2}{4\pi}=\frac{196\pi}{4\pi}\\\\r^2=49$

Taking square root on both sides

$\sqrt{r^2}=\sqrt{49}\\r=7$

The radius is 7 feet.

Volume of sphere = $\frac{4}{3}\pi r^3$

$Volume=\frac{4}{3}\pi (7)^3\\\\Volume= \frac{4}{3}\pi *343\\\\Volume = \frac{1372}{3}\pi$

The volume of sphere is $\frac{1372}{3}\pi$ feet cubed.

Keywords: volume, surface area

Learn more about surface area at:

#LearnwithBrainly

3 0

3 years ago

How many window coverings are necessary to span 50 windows if each window covering is 15 windows long?

julia-pushkina [17]

The correct answer is: 
4.

Explanation: 
To find this answer, we divide the number of windows, 50, by the length (in windows covered) of each covering, 15:
 $\frac{50}{15} = 3 \frac{1}{3}$ .
This means that 3 coverings won't quite be long enough, so we will need 4.

4 0

3 years ago