What is the answer 4x>8

Mathematics

1 answer:

kow [346]3 years ago

4 0

Answer:

if you want to find the value of x. then it's 2.

Step-by-step explanation:

but I feel like the question given is wrong because

4×2=8

and 8 is supposed to be equal to 8 not larger.

8=8

not

8 >8

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Jack is a car salesman who works strictly on commission. For every car he sells, he earns a 2% commission. Cars sell for $35,000

Nadya [2.5K]

First we need to find 2% of 35,000

2% equals 0.02 so we'll multiply 35,000 by 0.02

35,000 × 0.02 = 700

for every car he sells jack gets $700

now we need to divide that into 5,000

5,000 ÷ 700 = 7.14

now since you cannot sell 0.14 of a car you need to round up

he needs to sell 8 cars to meet his target income

4 0

2 years ago

35. In a simple random sample of 25 high school students, the sample mean of the SAT scores was 1450, and the sample variance wa

Tatiana [17]

Answer:

$1450-2.0\frac{30}{\sqrt{25}}=1450-12$

$1450+2.0\frac{30}{\sqrt{25}}=1450+12$

And the best option would be:

c. 1450 +/- 12

Step-by-step explanation:

Information provided

$\bar X=1450$ represent the sample mean for the SAT scores

$\mu$ population mean (variable of interest)

$s^2 = 900$ represent the sample variance given

n=25 represent the sample size

Solution

The confidence interval for the true mean is given by :

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

The sample deviation would be $s=\sqrt{900}= 30$

The degrees of freedom are given by:

$df=n-1=2-25=24$

The Confidence is 0.954 or 95.4%, the value of $\alpha=0.046$ and $\alpha/2 =0.023$ , assuming that we can use the normal distribution in order to find the quantile the critical value would be $z_{\alpha/2} \approx 2.0$