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tankabanditka [31]
3 years ago
8

Francis heard that a car stereo system was on sale for 30% off. If the sale price was $57.75, what was the original price of the

stereo?
The original price of the stereo is $________.
Mathematics
1 answer:
matrenka [14]3 years ago
3 0

Answer:

$75.08

Step-by-step explanation:

x over 57.75 = 30 over 100

57.75 * 30

1732.5 / 100

17.325

57.75 + 17.325

75.075

Simplify = $75.08

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laiz [17]

Answer:

Step-by-step explanation:

f(x)=-4x+2

g(x)=x²+1

(gof)(x)=g(f(x))=g(-4x+2)=(-4x+2)²+2=16x²-16x+4+2=16x²-16x+6

(gof)(3)=16(3)²-16(3)+6=144-48+6=150-48=102

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3 years ago
HELP PLEASE!! WILL GIVE BRAINLIEST TO CORRECT QNSWER.
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X = 1/2 =0.500

Mark as brainliest
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3 years ago
Gibbs Baby Food Company wishes to compare the weight gain of infants using its brand versus its competitor’s. A sample of 40 bab
Leviafan [203]

Answer:

z=\frac{(7.6-8.1)-0}{\sqrt{\frac{2.3^2}{40}+\frac{2.9^2}{55}}}}=-0.936  

The p value can be founded with this formula:

p_v =P(z  

Since the p value is higher than the significance level provided of 0.05 we have enough evidence to FAIL to reject the null hypothesis and we can't conclude that the true mean for the Gibbs brand is significantly lower than the true mean for the competitor

Step-by-step explanation:

Information given

\bar X_{1}=7.6 represent the mean for Gibbs products

\bar X_{2}=8.1 represent the mean for the competitor

\sigma_{1}=2.3 represent the population standard deviation for Gibbs

\sigma_{2}=2.9 represent the sample standard deviation for the competitor

n_{1}=40 sample size for the group Gibbs

n_{2}=55 sample size for the group competitor

\alpha=0.05 Significance level provided

z would represent the statistic

Hypothesis to verify

We want to check if babies using the Gibbs brand gained less weight, the system of hypothesis would be:  

Null hypothesis:\mu_{1}-\mu_{2}=0  

Alternative hypothesis:\mu_{1} - \mu_{2}< 0  

The statistic would be given by:

z=\frac{(\bar X_{1}-\bar X_{2})-\Delta}{\sqrt{\frac{\sigma^2_{1}}{n_{1}}+\frac{\sigma^2_{2}}{n_{2}}}} (1)  

Replacing the info given we got:

z=\frac{(7.6-8.1)-0}{\sqrt{\frac{2.3^2}{40}+\frac{2.9^2}{55}}}}=-0.936  

The p value can be founded with this formula:

p_v =P(z  

Since the p value is higher than the significance level provided of 0.05 we have enough evidence to FAIL to reject the null hypothesis and we can't conclude that the true mean for the Gibbs brand is significantly lower than the true mean for the competitor

5 0
3 years ago
Can someone please help me
Nookie1986 [14]
Sure What do u need help with I am always here
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3 years ago
Three eighths of the 32 children in the club were girls. <br> How many boys were in the club?
vivado [14]

Answer:

20

Step-by-step explanation:

3/8* 32= 12

32-12=20

12 Girls

20 Boys

8 0
3 years ago
Read 2 more answers
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