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
kati45 [8]
3 years ago
14

I need some help with this math problem. I've had it explained to me two different ways. If x= -3 then what would be the answer

to x^2 + 5 = ? My teacher says it is 14 but then someone else mentioned that order of operations says that the answer is -4. Help!!
Mathematics
2 answers:
nadya68 [22]3 years ago
8 0

Answer:

The square root of x will be evaluated first before the addition of 5. Hence (-3)^2 = 9 and 9 +5 = 14, as per your teacher's answer, which is correct. The answer would not be -4.

zlopas [31]3 years ago
8 0

\text{You have to solve by plugging in -3 to x:}\\\\(-3)^2+5\\\\\text{Solve:}\\\\(-3)^2+5\\\\9+5\\\\\boxed{14}\\\\\text{Your answer would be 14. The teacher is correct}

You might be interested in
Help!!!!!!!!! Homework due on Monday <br> Don’t understand at all!!! Thank youuuu
ch4aika [34]
So supplementary is an 180 angle and complimentary is 90 degree angle so that being said I could be wrong but that looks like a complimentary so a 90 degree angle it’s a 90 degree
8 0
3 years ago
Growth or decay, and determine the percentage rate of increase or decrease.
NNADVOKAT [17]

The expression y = 660(0.902)ˣ represents a decay , the rate of decrease is 9.8% .

In the question ,

it is given that ,

the the exponential function is y = 660(0.902)ˣ

we need to determine that , the equation represents a growth or decay .

0.902 is the variable that will determine a growth or decay .

Since, 0.902 is less than 1 , so it represents a decay function .


To find the rate we subtract 0.902 from 1

= 1 - 0.902

= 0.098

= 9.8% decrease rate

Therefore , The expression y = 660(0.902)ˣ represents a decay , the rate of decrease is 9.8% .

The given question is incomplete , the complete question is

Identify if it's Growth or Decay , and determine the percentage rate of increase or decrease , the function is y = 660(0.902)ˣ ?

Learn more about Growth and Decay here

brainly.com/question/22392518

#SPJ1

4 0
11 months ago
Ken is doing a layout for a new book. He has a drawing that is 12 centimeters by 10 centimeters, but the maximum space available
Temka [501]
2:3
Ratio problem

8:12 = 2:3
4 0
3 years ago
As part of the Pew Internet and American Life Project, researchers conducted two surveys in late 2009. The first survey asked a
REY [17]

Answer:

The 95% confidence interval for the difference between the proportion of all U.S. teens and adults who use social networking sites is (0.223, 0.297). This means that we are 95% sure that the true difference of the proportion is in this interval, between 0.223 and 0.297.

Step-by-step explanation:

Before building the confidence interval we need to understand the central limit theorem and the subtraction of normal variables.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean \mu = p and standard deviation s = \sqrt{\frac{p(1-p)}{n}}

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

Sample of 800 teens. 73% said that they use social networking sites.

This means that:

p_T = 0.73, s_T = \sqrt{\frac{0.73*0.27}{800}} = 0.0157

Sample of 2253 adults. 47% said that they use social networking sites.

This means that:

p_A = 0.47,s_A = \sqrt{\frac{0.47*0.53}{2253}} = 0.0105

Distribution of the difference:

p = p_T - p_A = 0.73 - 0.47 = 0.26

s = \sqrt{s_T^2+s_A^2} = \sqrt{0.0157^2+0.0105^2} = 0.019

Confidence interval:

Is given by:

p \pm zs

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

Lower bound:

p - 1.96s = 0.26 - 1.96*0.019 = 0.223

Upper bound:

p + 1.96s = 0.26 + 1.96*0.019 = 0.297

The 95% confidence interval for the difference between the proportion of all U.S. teens and adults who use social networking sites is (0.223, 0.297). This means that we are 95% sure that the true difference of the proportion is in this interval, between 0.223 and 0.297.

3 0
2 years ago
Jae's homework consists of 16 math problems. She has finished 4 problems so far.
VMariaS [17]
Jae has finished 25% of her homework.

<span><span>4/16
</span></span><span><span>=<span>1/4
</span></span></span><span><span>=1÷4
</span></span><span><span>=0.25</span></span>
3 0
2 years ago
Read 2 more answers
Other questions:
  • How do i solve 2//3x=12?
    15·2 answers
  • What is brown has a hump and lives at the north pole
    6·1 answer
  • Help 11 minutes!!!!!!
    9·1 answer
  • Solve 15 ≥ -3x or x ≥ -2. <br> A{x | x ≤ -5} <br> B{x | x ≥ -5}<br> C {all reals}
    13·2 answers
  • Help please very important
    13·1 answer
  • Does anybody know the answer to this question
    6·1 answer
  • PLEASE help I’ll mark you as the Brainiest please!!!!
    14·1 answer
  • What is the missing side of a rectangle with an area of 64 m2 and<br> a base of 4m?
    8·1 answer
  • Decrease 117 kg in the ratio 10:13​
    10·1 answer
  • Select all of the expression that are equivalent to 4(3x + 14y)
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!