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Marizza181 [45]
3 years ago
8

Help with on number 4 and 6 please! I will mark you the brainliest!

Mathematics
1 answer:
swat323 years ago
8 0

Answer:

4. 2 triangular faces, 9 edges, and 6 vertices

6. 2 rectangular faces, 12 edges, and 8 vertices

Step-by-step explanation:

Please mark brainliest :)

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$21 is what percent of $28
saveliy_v [14]

Answer:

75%

Step-by-step explanation:


4 0
3 years ago
The ratio of the ages (in years) of two teachers is 8 : 9. The sum of their ages is 51. What is the age of each teacher?
Keith_Richards [23]

Answer:

Check pdf

Step-by-step explanation:

Download pdf
8 0
3 years ago
Simplify: 8i^7+6i^5-5i^3-3i^2-7i-9
Dmitry_Shevchenko [17]
<span>Consider the remainder of the division of the power exponent of i by 4.
For a remainder r equal to 0, 1, 2 or 3, we have a power equal to 1, i, -1 or -i respectively, therefore:

</span>8i^7+6i^5-5i^3-3i^2-7i-9 =
8*(-i) + 6*i - 5*(-i) - 3*(-1) - 7i - 9 =
- 8i + 6i + 5i + 3 - 7i - 9 =
3 - 9 - 8i + 6i + 5i- 7i =
=\boxed{- 6 - 4i}

Answer:
\boxed{- 6 - 4i}

<span>

</span>
5 0
3 years ago
Quadratic equation
Murrr4er [49]

Answer:

<h2>            46</h2>

Step-by-step explanation:

x          -  age of a son three years ago

3x        -  age of a father three years ago

x + 3      -  age of the son now

3x + 3       -  age of the father now

x + 3 + 5       -  age of the son in five years time

3x + 3 + 5       -  age of the father in five years time

in five years time, the father will be twice as old as his son, so:

3x + 3 + 5 = 2(x + 3 + 5)

3x + 8 = 2x + 16

3x - 2x = 16 - 8

  x = 8

x + 3 + 4       -  age of the son in four years time

8 + 3 + 4 = 15

3x + 3 + 4       -  age of the father in four years time

3×8 + 3 + 4 = 31    

the sum of their ages in four years time:

15 + 31 = 46

8 0
3 years ago
the Firefighter ladder of the length 17 was kept at the at a distance of 8 metres from the building to reach the window of the b
Andre45 [30]

Answer:

The answer is 15 units hope that helps

Step-by-step explanation:

Apply pythagorean formulae here

Take the 17 as hypotenuse... And 8 as the base....

So the pythagorean formulae is

( hypotenuse) Square = (height) Square + (base) Square......

Hence put the values and the height comes as 15 units

BTW are u Indian?...

6 0
3 years ago
Read 2 more answers
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