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
valentina_108 [34]
3 years ago
10

X - 2y + 2z = -22 x + 3y - z = 03 x + 2y + 3z = -15

Mathematics
1 answer:
scZoUnD [109]3 years ago
7 0
What is your question?
You might be interested in
It takes 5 minutes for 7 people to drink 25 pints of water.At this rate,how long would it take 15 people to drink 160 pints of w
EastWind [94]

Answer:

14.9 min

Step-by-step explanation:

r=rate

r25=5*7

r25=35

r=35/25

r=1.4

substitution

r160=t*15

t=time

r=1.4

1.4*160=t*15

224=t*15/15

224/15=t

14.9 min

4 0
2 years ago
The length of time a person takes to decide which shoes to purchase is normally distributed with a mean of 8.21 minutes and a st
madam [21]

Answer:

4.55% probability that a randomly selected individual will take less than 5 minutes to select a shoe purchase.

Since Z > -2 and Z < 2, this outcome is not considered unusual.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

If Z \leq 2 or Z \geq 2, the outcome X is considered to be unusual.

In this question:

\mu = 8.21, \sigma = 1.9

Find the probability that a randomly selected individual will take less than 5 minutes to select a shoe purchase.

This is the pvalue of Z when X = 5. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{5 - 8.21}{1.9}

Z = -1.69

Z = -1.69 has a pvalue of 0.0455.

4.55% probability that a randomly selected individual will take less than 5 minutes to select a shoe purchase.

Since Z > -2 and Z < 2, this outcome is not considered unusual.

8 0
3 years ago
Math please help give u brainlist
RoseWind [281]

Answer:

C

Step-by-step explanation:

(0,-4) (-4, -3)

-3- -4 / -4 -0 = 1/-4 is the slope

so is C

7 0
3 years ago
Read 2 more answers
18√2 - 2√50 I need to know
MAXImum [283]

Answer:

8√2

Step-by-step explanation:

18√2 - 2√50 = 18√2 - 2√(2*25)=18√2 - 2*5√2= 18√2 - 10√2= 8√2

8 0
3 years ago
Read 2 more answers
PLEASE ANSWER! DESPERATE, DONT KNOW HOW TO DO IT!
Annette [7]

Answer:

a) x = -7

b) x = -3/2

c) x = -3/2

d) x = 2

e) x = -1

f) x = -2

g) x = 7/3

h) z = -18/5

i) x = 6

Explanation:

The are a couple of rules you should know first.

Negative exponent rule: a^{-x} = \frac{1}{a^{x}}

A negative exponent means the same thing as the positive exponent as a denominator under 1.

Exponent to another exponent: (a^{x})^{n}=a^{xn}

When raising an exponent to another exponent, you multiply the exponents.

Fraction as a base rule: (\frac{a}{b})^{x} = \frac{a^{x}}{b^{x}}

Apply the exponent to the numerator and denominator.

Base 1 rule: 1^{x} = 1

1 to the power of anything is 1.

Focus on exponents only: a^{x} = a^{n}\\x = n

If the bases are the same on both sides of the equation, you can solve for "x" in the exponent by focusing on it only.

Write as an exponent: Rewrite a normal number as an exponent instead. Example: 8=2^{3} or 125=5^{3}

Also, you need to know how to rearrange and simplify formulas to isolate variables (by doing reverse operations in reverse BEDMAS order).

Know how to use the distributive property with brackets, when you multiply each of the terms in the brackets with the term on the outside.

Use each of these rules to solve.

a) 2^{x+4} = \frac{1}{8}   Write 8 as exponent

2^{x+4} = \frac{1}{2^{3}}   Negative exponent rule

2^{x+4} = 2^{-3}   Focus on exponents only

x+4 = -3   Subtract 4 from each side to isolate

x = -3-4

x = -7

b) 9^{x}=\frac{1}{27}   Write 27 as exponent

9^{x}=\frac{1}{3^{3}}   Write 9 as exponent

(3^{2})^{x}=\frac{1}{3^{3}}   Exponent to another exponent

3^{2x}=\frac{1}{3^{3}}   Negative exponent rule

3^{2x}=3^{-3}   Focus on exponents only

2x=-3   Divide both sides by 2 to isolate

x=-\frac{3}{2}

c) 25^{x}=\frac{1}{125}   Rewrite 125 as exponent

25^{x}=\frac{1}{5^{3}}   Rewrite 25 as exponent

(5^{2})^{x}=\frac{1}{5^{3}}   Exponent to another exponent

5^{2x}=\frac{1}{5^{3}}   Negative exponent rule

5^{2x}=5^{-3}   Focus only exponents only

2x=-3   Divide both sides by 2 to isolate

x=-\frac{3}{2}

d)  7(3^{x})=63   Divide both sides by 7 to isolate

3^{x}=63/7

3^{x}=9   Write 9 as exponent

3^{x}=3^{2}   Focus on exponents

x=2

e) 10^{3x}=0.001   Write 0.001 as fraction

10^{3x}=\frac{1}{1000}   Write 1/1000 as exponent

10^{3x}=\frac{1}{10^{3}}   Neg. exponent

10^{3x}=10^{-3}   Focus on exponents

3x=-3   Divide both sides by -3

x=-3/3

x=-1

f) 6(\frac{1}{10})^{x}=600   Divide both sides by 6

(\frac{1}{10})^{x}=\frac{600}{6}

(\frac{1}{10})^{x}=100  Write 100 as exponent

(\frac{1}{10})^{x}=10^{2}   Fraction as base rule

\frac{1^{x}}{10^{x}}=10^{2}   Base 1 rule

\frac{1}{10^{x}}=10^{2}   Neg. exponent

10^{-x}=10^{2}   Focus on exponent

-x=2   Divide both sides by -1

x=-2

g) 27^{x-3}=(\frac{1}{3})^{2}   Write 27 as exponent

(3^{3})^{x-3}=(\frac{1}{3})^{2}   Exponent to another exponent

3^{3(x-3)}=(\frac{1}{3})^{2}   Fraction as base

3^{3(x-3)}=\frac{1^{2}}{3^{2}}   Base 1 rule

3^{3(x-3)}=\frac{1}{3^{2}}   Neg. exponent

3^{3(x-3)}=3^{-2}   Focus

3(x-3)=-2   Distribute over brackets

3x-9=-2   Add 9 to both sides

3x=-2+9

3x=7   Div. both sides by 3

x=\frac{7}{3}

h) 4^{\frac{2z}{3}} = 8^{z+2}   Write 4 as exponent

(2^{2})^{\frac{2z}{3}} = 8^{z+2}   Exponent to another exponent

2^{2\frac{2z}{3}} = 8^{z+2}   Write 8 as exponent

2^{2\frac{2z}{3}} = (2^{3})^{z+2}   Exponent to another exponent

2^{2\frac{2z}{3}} = 2^{3(z+2)}   Focus

2\frac{2z}{3} = 3(z+2)   Multiply whole number with fraction

\frac{4z}{3} = 3(z+2)   Distribute

\frac{4z}{3} = 3z+6   Multiply both sides by 3

4z = 3(3z+6)   Distribute

4z = 9z+18   Subtract 9z from both sides

4z-9z = 18

-5z = 18   Div. both sides by -5

z = -\frac{18}{5}

i) 5(2)^{x-1}+3=163   Subtract 3 on both sides

5(2)^{x-1}=163-3

5(2)^{x-1}=160   Div. both sides by 5

(2)^{x-1}=160/5

(2)^{x-1}=32   Write 32 as exponent

(2)^{x-1}=2^{5}   Focus

x-1=5   Add 1 to both sides

x=5+1

x=6

5 0
3 years ago
Other questions:
  • CAN SOMEONE HELP ME PLEASEEE
    14·2 answers
  • Draw and label __ __ Trapezoid ZOID with ZO II ID and IO= ZD
    11·2 answers
  • Calendar: discount, 75%, sale price, $2.25, find the orignal sale price
    8·2 answers
  • A cube shaped box has a volume of 27 cubic cm. what's the length of the box? how would you figure this out
    9·2 answers
  • Solve 27 and 29, will give BRAINLIST!!
    13·2 answers
  • What is the result of -3+5 on a number line
    13·2 answers
  • Answer and explain 13 - 9 + 1 =5
    14·1 answer
  • Solve the equation 3х2 – 48
    11·1 answer
  • Function 1 is defined by the equation p= --3/2r - 5. function 2 is defined by the following table. Which function has a greater
    15·1 answer
  • 3. Find cos(A). Show your work and reduce the ratio if necessary.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!