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gogolik [260]
3 years ago
12

If f(x)=3^x+10 and g(x)=2x-4, find (f+g)(x)

Mathematics
1 answer:
Semmy [17]3 years ago
5 0

Answer:

4

Step-by-step explanation:

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Step-by-step explanation:

f^-1(x)=x/2+3

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7 \frac{37}{55}

Step-by-step explanation:

In order to solve an equation like this, you'll need to find a common denominator for your Fraction.

7 \frac{2}{5} + \frac{3}{11}

7 \frac{22}{55} + \frac{15}{55}

7 \frac{37}{55}

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The mean number of children among a sample of 15 low-income households is 2.8. The mean number of children among a sample of 19
gtnhenbr [62]

Answer:

Step-by-step explanation:

Let's put the data as below:

n1=15    x1=2.8      s1=1.6       and s1²=2.56

n2=19   x2=2.4     s2=1.7        and s2²=2.89

alpha= 0.05

To test the hypothesis:

H0= There is no sufficient evidence that low income household have fewer children

H1=There is sufficient evidence that low income household have fewer children

Assume that population variances are equal.

the t-static for two samples,

t=\frac{x1-x2}{Sp\sqrt{\frac{1}{n1}-\frac{1}{n2} \\} } } ~t with min (n1-1,n2-1)df

The pooled variance estimate Sp equals:

Sp^{2}=\frac{(n1-1)s1^{2}+(n2-1)s2^{2}  }{n1+n2-2}

Sp²=2.7456

Sp=1.65699

Degrees of freedom=n1+n2-2=32

Under null hypothesis:

tcal=\frac{|2.8 - 2.4|}{1.6599\sqrt{\frac{1}{15}+\frac{1}{19}  } }

tcal=0.6989

The critical value ttab=2.0369 for alpha=0.05

So we reject our null hypothesis H0

So there is sufficient evidence that low income households have fewer children than high income households

6 0
3 years ago
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