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3 years ago

HELPPPP!!!! ASAP!!!!! NEED BEFORE TOMORROW!!!! I'll give 20 points!!!

Mathematics

1 answer:

olya-2409 [2.1K]3 years ago

3 0

#1:(A)

#2:(E)

#3:(C)

Hope it helps!

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2x + 5= 12 whats x?

nignag [31]

Answer:

x = 7/2 = 3 1/2

Step-by-step explanation:

2x + 5= 12

Subtract 5 from each side

2x + 5-5= 12-5

2x = 7

Divide each side by 2

2x/2 =7/2

x = 7/2

Changing from an improper fraction to a mixed number

2 goes into 7 3 times with 1 left over

x = 3 1/2

7 0

3 years ago

Read 2 more answers

PLEASE HELP!!

tekilochka [14]

-5-12=-17 so it is b)

8 0

4 years ago

If (2i/2+i)-(3i/3+i)=a+bi, then a= A. 1/10 B. -10 C. 1/50 D. -1/10

Verizon [17]

Answer:

Option A is correct.

Step-by-step explanation:

We are given:

$\frac{2i}{2+i}-\frac{3i}{3+i} = a+bi$

We need to find the value of a.

The LCM of (2+i) and (3+i) is (2+i)(3+i)

$=\frac{2i(3+i)}{(2+i)(3+i)}-\frac{3i(2+i)}{(2+i)(3+i)}\\=\frac{6i+2i^2}{(2+i)(3+i)}-\frac{6i+3i^2}{(2+i)(3+i)}\\=\frac{6i+2i^2-(6i+3i^2)}{(2+i)(3+i)}\\=\frac{6i+2i^2-6i-3i^2)}{5+5i}\\=\frac{-i^2}{5+5i}\\i^2=-1\\=\frac{-(-1)}{5+5i}\\=\frac{1}{5+5i}$

Now rationalize the denominator by multiplying by 5-5i/5-5i

$=\frac{1}{5+5i}*\frac{5-5i}{5-5i} \\=\frac{5-5i}{(5+5i)(5-5i)}\\=\frac{5-5i}{(5+5i)(5-5i)}\\(a+b)(a-b)= a^2-b^2\\=\frac{5(1-i)}{(5)^2-(5i)^2}\\=\frac{5(1-i)}{25+25}\\=\frac{5(1-i)}{50}\\=\frac{1-i}{10}\\=\frac{1}{10}-\frac{i}{10}$

We are given

$\frac{2i}{2+i}-\frac{3i}{3+i} = a+bi$

Now after solving we have:

$\frac{1}{10}-\frac{i}{10}=a+bi$

So value of a = 1/10 and value of b = -1/10

So, Option A is correct.

8 0

4 years ago

5. The mall and library are 8 miles apart. On a map, the two buildings are 2 inches apart. How many miles does 1 inch represent

sammy [17]

4 miles represent one inch on the map.

This is because since they are 8 miles apart, and 2 inches in the map, and you want to find out how many miles per inch. You divide 8 by 2 because you want to divide how many miles by how many inches so that you can get 2 parts. That's how you get four.
Now that you cut 8 miles into two parts, you have halves, and half of eight is 4. And 1 inch represents that half since 1 + 1 equals 2 and 4 miles represents each of the two parts since 4+4 equals 8.

5 0

4 years ago

Find the area of a face of a rectangular prism.

Andru [333]

Answer:

It is L*W*H.

Width times Height

Step-by-step explanation:

I don't know what you are exactly talking about, there are no attached worksheet. But if you are talking about the formula for the rectangular prism.

Formula for rectangle prism: L*W*H

Area of the front of the prism: Width times height

5 0

4 years ago