1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
MAXImum [283]
3 years ago
8

Please help with math, due soon. Worth lots of points.

Mathematics
1 answer:
Dahasolnce [82]3 years ago
4 0

Answer:

5) 3x-4x

6) 7+5x-9x

7) 16r+6-1-32r

8) 19x-1-2x

You might be interested in
He radius of a sphere is 6 centimeters. Which is the volume of the sphere?
Katarina [22]

Answer:

904.32

Step-by-step explanation:

i think this is correct

5 0
3 years ago
How do you answer (-3)² ?
nadya68 [22]
The two at the top technically means  how many times the number in the bracket times ITSELF by, so its technically -3 x -3 which is +9 , cause a negative x negative = positive

7 0
3 years ago
Read 2 more answers
Ten samples of coal from a northern appalachian source had an average mercury content of 0.242 ppm with a standard deviation of
Dovator [93]
The confidence interval is from 0.2191 to 0.2649, given by

0.242\pm0.0229.

The z-score we need is found by first subtracting the confidence level from 1:
1 - 0.95 = 0.05

Divide that by 2:
0.05/2 = 0.025

Subtract that from 1:
1 - 0.025 = 0.975

Look this up in the middle of a z-table (http://www.z-table.com) and we see that the z-score is 1.96.

Now our confidence interval is given by
\overline{x} \pm z\times \frac{\sigma}{\sqrt{n}}
\\
\\0.242\pm 1.96 \times (\frac{0.037}{\sqrt{10}})
\\
\\0.242 \pm .0229
\\
\\0.242-0.0229=0.2191
\\
\\0.242+0.0229 = 0.2649
5 0
3 years ago
Solve the following system
scZoUnD [109]

Answer:

{x = -4 , y = 2 ,  z = 1

Step-by-step explanation:

Solve the following system:

{-2 x + y + 2 z = 12 | (equation 1)

2 x - 4 y + z = -15 | (equation 2)

y + 4 z = 6 | (equation 3)

Add equation 1 to equation 2:

{-(2 x) + y + 2 z = 12 | (equation 1)

0 x - 3 y + 3 z = -3 | (equation 2)

0 x+y + 4 z = 6 | (equation 3)

Divide equation 2 by 3:

{-(2 x) + y + 2 z = 12 | (equation 1)

0 x - y + z = -1 | (equation 2)

0 x+y + 4 z = 6 | (equation 3)

Add equation 2 to equation 3:

{-(2 x) + y + 2 z = 12 | (equation 1)

0 x - y + z = -1 | (equation 2)

0 x+0 y+5 z = 5 | (equation 3)

Divide equation 3 by 5:

{-(2 x) + y + 2 z = 12 | (equation 1)

0 x - y + z = -1 | (equation 2)

0 x+0 y+z = 1 | (equation 3)

Subtract equation 3 from equation 2:

{-(2 x) + y + 2 z = 12 | (equation 1)

0 x - y+0 z = -2 | (equation 2)

0 x+0 y+z = 1 | (equation 3)

Multiply equation 2 by -1:

{-(2 x) + y + 2 z = 12 | (equation 1)

0 x+y+0 z = 2 | (equation 2)

0 x+0 y+z = 1 | (equation 3)

Subtract equation 2 from equation 1:

{-(2 x) + 0 y+2 z = 10 | (equation 1)

0 x+y+0 z = 2 | (equation 2)

0 x+0 y+z = 1 | (equation 3)

Subtract 2 × (equation 3) from equation 1:

{-(2 x)+0 y+0 z = 8 | (equation 1)

0 x+y+0 z = 2 | (equation 2)

0 x+0 y+z = 1 | (equation 3)

Divide equation 1 by -2:

{x+0 y+0 z = -4 | (equation 1)

0 x+y+0 z = 2 | (equation 2)

0 x+0 y+z = 1 | (equation 3)

Collect results:

Answer:  {x = -4 , y = 2 ,  z = 1

4 0
3 years ago
Which triangles can have two sides of the same lenghth
grin007 [14]
The answer is Isosceles triangle
5 0
3 years ago
Other questions:
  • Solve 14ab²x³ over 2abx²
    11·2 answers
  • Find the circumference of a circle with a diameter of 20 inches
    11·1 answer
  • The U.S. Food and Drug Administration (FDA) performed a study that compared the carbohydrate content (as a percentage of weight)
    5·1 answer
  • The diagonals of a square are
    15·1 answer
  • Fredericka can make 65 percent of her shots from the free-throw line. If she shoots 75 times, how many shots can she expect to m
    7·1 answer
  • A letter from the word probability is chosen at random. find each probability
    14·1 answer
  • Complete the following with the appropriate symbol
    7·1 answer
  • 3. Maria and her friends want to go bowling. They called the local
    9·1 answer
  • CAN U PLS ANSWER WILL GIVE BRAINLIEST
    6·1 answer
  • Can someone describe this to me? I don't understand..
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!