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son4ous [18]
3 years ago
13

Please help 20 points

Mathematics
2 answers:
insens350 [35]3 years ago
7 0

Step-by-step explanation:

4•10/11 +7•9/11

=54/11+86/11

=140/11

=12•8/11

Snezhnost [94]3 years ago
5 0

Answer:

12\frac{8}{11}

Step-by-step explanation:

4\frac{10}{11} +7\frac{9}{11}

→ Add the whole numbers and numerators

11\frac{19}{11}

→ Turn into proper mixed fraction

12\frac{8}{11}

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Which of the following equations is a constant function?<br><br> x = 5<br> y = x<br> y = 5
GalinKa [24]

Answer:

Y=X

Step-by-step explanation:

5 0
3 years ago
A gas station sells two grades of gasoline: regular and super. These are priced at $2.00 and $3.00 per gallon, respectively. Let
djyliett [7]

Answer:

(a) E(Y) = 4400

sd (Y) =225

(b)  P(Y ≤ 4500) = 0.67003

(c) P (X₁ > X₂) = 0.31744

Step-by-step explanation:

(a) Here we have

Y = 2·X₁ + 3·X₂

Therefore E(Y) = 2·E(X₁) + 3·E(X₂) = 2000 + 2400 = 4400

sd(Y) is given by

Variance Y = (sd (Y))² = 2²·(sd (X₁))² + 3²·(sd (X₂))²

= 4·8100 + 9·2025 =  50625

sd (Y) = √50625 = 225

(b) The probability that the revenue does not exceed 4500 is given by

P(Y ≤ 4500) =  P(z ≤0.444)

z = \frac{\overline{\rm x} - \mu} {\sigma /\sqrt{n} }

z = \frac{4500 - 4400} {225 /\sqrt{1} } = 0.444

Therefore from the normal distribution table, we have

P = 0.67003

(c) The probability that the P(X₁ > X₂)

Since the gas station sells 2 portions of X₁ to 3 portions of X₂

Therefore, the probability that the gas station sells more of X₁ is given by

₅C₀ × 2/5⁰×3/5⁵ = 0.07776

₅C₁ × 2/5¹×3/5⁴=  0.2592

₅C₂ × 2/5²×3/5³ = 0.3456

P (X₁ > X₂) = 1 - 0.68256 = 0.31744

6 0
3 years ago
Read 2 more answers
Answer all question pls
Arada [10]

Step-by-step explanation:

3. Between √9 and √16 or 3 nd 4

5. D

6. 7cubic inches

7. 8/45

8. 0.5 m

9. 4/25

5 0
2 years ago
Please help me out with this
tekilochka [14]
Yes they are similar
7 0
2 years ago
Submit your solution. A=h/2(a+b); for h
Nimfa-mama [501]
A=h/2(a+b)
A=h/2a+2b
A(2a+2b)=h
8 0
3 years ago
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