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3 years ago

7 - 3 ( 5t - 10 ) = 67

Mathematics

2 answers:

victus00 [196]3 years ago

6 0

$7-3(5t-10)=67$

$7-(3*5t-3*10)=67$

$7-15t-(-30)=67$

$7-15t+30=67$

$-15t=67-30-7$

$-15t=30$

then...

$t=-\frac{30}{15}$

$\boxed{\boxed{t=-2}}$

anyanavicka [17]3 years ago

6 0

Answer in an annex
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Answer:

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6w+4w=5/8*48

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Sindrei [870]

Answer:

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And replacing we got:

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And replacing we got:

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Step-by-step explanation:

We have the following distribution

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Part a

For this case:

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Part b

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$P(X\geq 3) =1-P(X$

And replacing we got:

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Part d

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Part e

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$E(X)= \sum_{i=1}^n X_i P(X_i)$

And replacing we got:

$E(X) =0*0.2 +1*0.3+2*0.1 +3*0.1 +4*0.3= 2$

Part f

We can find the second moment with this formula

$E(X^2)= \sum_{i=1}^n X^2_i P(X_i)$

And replacing we got:

$E(X^2) =0^2*0.2 +1^2*0.3+2^2*0.1 +3^2*0.1 +4^2*0.3= 6.4$

And the variance would be:

$Var(X0 =E(X^2)- [E(X)]^2 = 6.4 -(2^2)= 2.4$

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lys-0071 [83]

Answer:

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DochEvi [55]

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3 years ago