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2 years ago

Solve the system of equations -4+11y=15 x=2y

Mathematics

2 answers:

snow_tiger [21]2 years ago

5 0

Had this problem

x=10

y=5

kondaur [170]2 years ago

3 0

To solve this I will be using substitution

-4 + 11y = 15
solve for y so

-4 + 11y = 15
11y = 19

y = 19/11

x = 2(19/11)

19/11 x 2 = 38/11

x = 38/11

x = 38/11
y = 19/11

I hope this helps!

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Answer:

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3 years ago

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2 years ago

The table gives the surface areas, in square kilometres, of five seas.

zlopas [31]

The table is missing, so i have attached it.

Also, the correct question is;

The surface area of the East China Sea is k times the surface area of the Baltic Sea.

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Give your answer to the nearest whole number

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k = 3

Step-by-step explanation:

From the attached table,

Surface area of east china = 1.25 × 10^(6) km²

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We are told that the surface area of East China Sea is k times that of the surface area of the Baltic Sea.

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2 years ago

10.5% of the population is 65 or older. Find the probability that the following number of persons selected at random from 25 peo

julia-pushkina [17]

Given:

The sample size n=25

Probability of population is 65 or older is 10.5%.

This date follows the binomial distribution,

$\begin{gathered} n=25,p=0.105 \\ X\rightarrow B(n=25,p=0.105) \end{gathered}$

To find the probability that at most 2 are 65 or older,

$\begin{gathered} P(X=x)=^nC_x(p)^x(1-p)^{n-x} \\ P(0\leq X\leq2)=P(X=0)+P(X=1)+P(X=2) \\ =^{25}C_0(0.105)^0(1-0.105)^{25-0}+^{25}C_1(0.105)^1(1-0.105)^{25-1}+^{25}C_2(0.105)^2(1-0.105)^{25-2} \\ =0.0625+0.1832+0.2579 \\ =0.5036 \\ \approx0.504 \end{gathered}$

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8 0

9 months ago