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2 years ago

If x + 3y = 7 and y = 2, then x equals

Mathematics

2 answers:

borishaifa [10]2 years ago

6 0

Answer:

Step-by-step explanation:

x + 3y = 7

x + 3y = 2

3y = 3 x y

y = 2

3 x 2 = 6y

x + 6 = 7

7 - 6 = 1

x = 1

Plz give brainliest

Vaselesa [24]2 years ago

5 0

The answer is one . 3 times 2 is 6. And you know 6+1 =7

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In a study, 36% of adults questioned reported that their health was excellent. A researcher wishes to study the health of peop

steposvetlana [31]

Answer:

0.3907

Step-by-step explanation:

We are given that 36% of adults questioned reported that their health was excellent.

Probability of good health = 0.36

Among 11 adults randomly selected from this area, only 3 reported that their health was excellent.

Now we are supposed to find the probability that when 11 adults are randomly selected, 3 or fewer are in excellent health.

i.e. $P(x\leq 3)=P(x=1)+{P(x=2)+P(x=3)$

Formula : $P(x=r)=^nC_r p^r q ^ {n-r}$

p is the probability of success i.e. p = 0.36

q = probability of failure = 1- 0.36 = 0.64

n = 11

So, $P(x\leq 3)=P(x=1)+{P(x=2)+P(x=3)$

$P(x\leq 3)=^{11}C_1 (0.36)^1 (0.64)^{11-1}+^{11}C_2 (0.36)^2 (0.64)^{11-2}+^{11}C_3 (0.36)^3 (0.64)^{11-3}$

$P(x\leq 3)=\frac{11!}{1!(11-1)!} (0.36)^1 (0.64)^{11-1}+\frac{11!}{2!(11-2)!} (0.36)^2 (0.64)^{11-2}+\frac{11!}{3!(11-3)!} (0.36)^3 (0.64)^{11-3}$

$P(x\leq 3)=0.390748$

Hence the probability that when 11 adults are randomly selected, 3 or fewer are in excellent health is 0.3907

5 0

3 years ago

Solve using elimination. -7x – 5y = -4 7x + 9y = -4

Brut [27]

-7x-5y=-47x+9y=-4

combine like terms to cross out the 7x
solve for y, to get -2
plug it back in to one of the equations and x is 2

y=-2
x=2

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3 years ago

San Antonio, Texas, is located about 30° north of the equator. If Earth's radius is about 3959 miles, approximately how many mil

marusya05 [52]

I have no clue but using division may be an option

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2 years ago

The sum of three consecutive integers is 267. What is the largest integer? (1 point)

Anna11 [10]

Answer:

2=1

Step-by-step explanation:

6 0

3 years ago

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How do you do 7-12? How do you do 13-18?

eimsori [14]

7-12 is like a negative number so it will be -5. And 13-18 would be -5 also.

7 0

3 years ago

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