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anzhelika [568]
3 years ago
13

Help plz. No links. What is 8.21 times 4.2? Show your work.

Mathematics
2 answers:
worty [1.4K]3 years ago
7 0

Answer:

34.482 is the answer to your question

bulgar [2K]3 years ago
6 0
Answer: 34.482

Explanation:
Line up the numbers on the right
Starting in the right, multiple each digit in the top number by each digit in the bottom number, just as with whole number.
Add the products

Hope this helped! It’s hard to show my work on here
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Solve this please .......​
nikdorinn [45]

Answer:

The sum of reciprocals is 2/3.

You don't need complex numbers to solve this, but if you try to find a and b you will need complex numbers.

Step-by-step explanation:

a+b = 2

a*b = 3

1/a + 1/b = x

(a*b)*(1/a + 1/b) = (a*b)x

b + a = (a*b)(x)

2 = 3x

x = 2/3

b = 2 - a

a*(2 - a) = 3

-a^2 + 2a = 3

-a^2 + 2a - 3 = 0

a^2 - 2a + 3 = 0

let's solve the quadratic equation

a^2 - 2a + 3 = a^2 - 2a + 1 + 2 = (a - 1)^2 + 2 = 0

(a - 1)^2 = -2

a_1 - 1 = \sqrt{2}i\\a_1 = 1+\sqrt{2}i\\\\a_2 - 1 = -\sqrt{2}i\\a_2 = 1 - \sqrt{2}i\\

these options correspond to a and b from the original question.

8 0
2 years ago
Val is going to plant n vegetables seeds in one garden and 2n+5 vegetables seeds in another. How many seeds is Val going to plan
mezya [45]
Val will plant:
2n+5+n
seeds. 

This is equal to:
3n+5

So, in total, Val will plant 3n + 5 seeds.
8 0
3 years ago
11. Find the average rate of change of the equation y = x2 + 4x + 1 on the interval -1 < x < 4.
coldgirl [10]

Answer:

31/5

Step-by-step explanation:

[f(4) - f(-1)] / 4-(-1)

7 0
2 years ago
What is the length of segment AB? (4 points)
Sveta_85 [38]

Answer:

10 units

Step-by-step explanation:

\sqrt{(0-6)^{2} +(10-2)^{2} }\\\\\sqrt{(-6)^{2}+(8)^{2} } \\\\\sqrt{36+64}\\\\\sqrt{100}\\\\10

3 0
3 years ago
The volume of this rectangular solid is?
Maru [420]

Well, volume is: length x width x height


so, 5 x 14 x 8= 560 inches

8 0
3 years ago
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