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
mixas84 [53]
3 years ago
15

Evaluate the expression, using the given value of the variable z÷3-5z+4 (z-2) when z=12

Mathematics
1 answer:
zvonat [6]3 years ago
7 0
12/3-5(12)+4(12-2)
pemdass
12-2=10

12/3-5(12)+4(10)
divide or multiply
12/3=4
5(12)=60
4(10)=40

we now have
4-60+40
add
-16
You might be interested in
HHEELLPP ME GET A GOOD GRADE
muminat
\bf ~~~~~~~~~~~~\textit{middle point of 2 points }
\\\\
A(\stackrel{x_1}{2m}~,~\stackrel{y_1}{2n})\qquad 
C(\stackrel{x_2}{2p}~,~\stackrel{y_2}{2r})
\qquad
%   coordinates of midpoint 
\left(\cfrac{ x_2 +  x_1}{2}~~~ ,~~~ \cfrac{ y_2 +  y_1}{2} \right)
\\\\\\
\left( \cfrac{2p+2m}{2}~~,~~\cfrac{2r+2n}{2} \right)\implies \left( \cfrac{\underline{2}(p+m)}{\underline{2}}~~,~~\cfrac{\underline{2}(r+n)}{\underline{2}} \right)
\\\\\\
~~~~~~~~[(p+m)~,~(r+n)]
6 0
2 years ago
You have a new pool and want to know its volume. The pool is 5 feet deep and has a radius of 7 feet. How much water can a pool h
leva [86]

Answer:

769.6902 (or 769.3) cubic feet of water

Step-by-step explanation:

πr^2

r = 7

5 x π(7)^2 = 769.6902 (or 769.3 using 3.14)

5 0
2 years ago
Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car. Whe
kherson [118]

Answer:

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}  

n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11  

And rounded up we have that n=1068

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{p(1-p)}{n}})

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.03 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)

We don't have a prior estimation for the proportion \hat p so we can use 0.5 as an approximation for this case  

And replacing into equation (b) the values from part a we got:

n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11  

And rounded up we have that n=1068

5 0
3 years ago
Suppose you had d dollars in your bank account. You spent $6 but have at least $25 left. How much money did you have initially?
Eddi Din [679]

d-6≥25

d-6+6≥25+6

d≥31

7 0
3 years ago
-1/2(-3y+10) i need help combining like terms to create a equivelent expression
Vaselesa [24]

Answer:

1.5y - 5

Step-by-step explanation:

I used the distributive approach and distributed -1/2 to the -3y and 10.

(If you try this and it's incorrect, you may just need to distribute -1/2 to the 10, creating -3y - 5.)

6 0
3 years ago
Other questions:
  • A football team loses a total of 12 yards in 4 plays. On average how many yards did the team move the ball per play?
    11·1 answer
  • Plz help...................
    15·2 answers
  • What is the diameter of a circle with an area of 100 pie square feet
    5·1 answer
  • I need help please. daad
    6·1 answer
  • How do you solve <br> 8.4-6.8=-3.2y+16.4
    7·2 answers
  • On a standardized test, Rasi answered the fast: 22 questions in 5 minutes. There are 7]
    8·1 answer
  • Brianna wants to plot -2 and - 6 on a number line. Which statement is true?
    9·1 answer
  • A rectangular prism has a length of 114 centimeters, a width of 4 centimeters, and a height of 314 centimeters.
    9·2 answers
  • Five members of a mystery-book club each read a 1,296-page book. Nine members of a fantasy-book club each read a 398-page book.
    10·1 answer
  • 4. A 40 foot ladder is leaning against the side of a building. If the bottom of the ladder is 24
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!