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yaroslaw [1]
3 years ago
6

Please help these are not easy for me

Mathematics
1 answer:
Pavel [41]3 years ago
7 0

Answer:

12a^2 - 9a + 5

Step-by-step explanation:

(5a^2 - 6a - 4) - (-7a^2 + 3a - 9)

5a^2 + 7a^2 = 12a^2

-6a - 3a = -9a

-4 + 9 = 5

12a^2 - 9a + 5

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1. please help me and i’ll give brainliest if it’s right
baherus [9]

Answer:

13

Step-by-step explanation:

5 0
3 years ago
A mole of 1 gallon cans of paint could cover every square inch of the surface of how many planets the size of the earth?
Nady [450]

Answer:

The answer is 4.4*10^1^0 planets

Step-by-step explanation:

We ll have to find more information first to solve this question.

1. One mole = 6.022 x 10^23

Assuming one gallon of paint covers the 400 sq ft of area.

Thus total area which can be covered by 1 mole of gallon is

=6.022*10^2^3 * 400\\=2.40*10^2^6

2. Now we will find the surface area of earth

Area = 4\pi R^2

The radius of earth is 2.1 x 10^7 Feet

substituting values

Area = 4*3.14*(2.1*10^7)^2\\Area = 5.5*10^1^5ft^2

3. Now we will find out the number of planets of earth size which can be covered by mole of gallon of paint

= Total area one mole of gallon can cover / area of earth

= 2.40 * 10^2^6/5.5*10^1^5\\=4.4*10^1^0 planets

6 0
3 years ago
Enter the correct answer in the box. Write the sum of √28x^6 + 4√7x^6 in simplest form, if x ≠ 0.
kap26 [50]

Answer:

21.97025026/250

4 0
3 years ago
T=v /6 + 5<br> a) Work out the value of T when v = 42
Leno4ka [110]

The value of T in the equation if v = 42 is 12

<h3>How to solve algebra</h3>

Given:

T= v /6 + 5

If v = 42, find T

  • substitute 42 for v in the equation

T= v /6 + 5

T = 42/6 + 5

  • solve the fraction first

T = 7 + 5

T = 12

Therefore, the value of T in the equation if v = 42 is 12

Learn more about algebra:

brainly.com/question/4344214

8 0
2 years ago
16. On June 8, 1992, a crop circle with an 18-meter radius was found in a wheat field near Szekesfehervar,
stepladder [879]
The answer is B or 113.04 m
8 0
3 years ago
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