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3 years ago

Please I really need help

Mathematics

2 answers:

EleoNora [17]3 years ago

5 0

Answer:x=3

Step-by-step explanation:

What you do is add 5+26 but change 5 to a negative so -5+26 and then divide 7x and 21 which gets 3

viva [34]3 years ago

3 0

You’re answer would be B

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nevsk [136]

Answer:

take your pick. Each has its own reason.

Step-by-step explanation:

As with a lot of "doesn't belong" problems, the one that is different depends on your criteria. In the attached figure, each one "doesn't belong" for a different reason. Those reasons are listed below each number line.

I might choose the lower left: "addition, not subtraction", as it is the only one with arrows in the same direction. That makes its difference from the others more obvious, perhaps.

6 0

3 years ago

1. Jack is 30 years old and Alice is 35 years old. What percent of Alice's age is Jack, rounded to the nearest tenth of a percen

Firlakuza [10]

The answer would be 57percent

4 0

3 years ago

8.006 minus 6.38 awnser

Nutka1998 [239]

8.006
-6.38 = 1.626

Hope this help

3 0

3 years ago

In a fish tank, there are 3 orange fish, 5 blue fish and 6 yellow fish. In simplest form, what is the ratio of yellow

Lemur [1.5K]

Answer:

B. 2:1, for every two yellow fish there is one orange fish

Step-by-step explanation:

So you have 6 yellow fish and 3 orange fish.

You can divide both these values by 3 to get:

2 yellow fish: 1 orange fish

Therefore, the simplified version of the ratio is 2:1

In context this means for every 2 yellow fish there is 1 orange fish.

The answer is then B.

<em>I hope this helps!!</em>

5 0

3 years ago

A publisher reports that 55% of their readers own a laptop. A marketing executive wants to test the claim that the percentage is

Irina18 [472]

Answer:

We fail to reject the null hypothesis, we accept H₀

Step-by-step explanation:

Population proportion p₀ = 55 % p₀ = 0,55

Sample size n = 280

Sample mean p = 51 % p = 0,51 q = 0,49

n*p and n*q are both bigger than 10 therefore we can approximate the binomial distribution to a normal distribution

Test Hypothesis

Null Hypothesis H₀ p = p₀

Alternative Hypothesis Hₐ p ≠ p₀

Significance level is α = 0,05 but we have a two-tail test then

α/2 = 0,025

z(c) = - 1,96

Computing z(s)

z(s) = ( p - p₀ ) / √(p*q)/n

z(s) = ( 0,51 - 0,55 ) / √(0,51*0,49)/280

z(s) = - 0,04 * 16,73 / 0,5

z(s) = - 1,34

Comparing

z(s) and z(c)

- 1,34 < - 1,96

| z(s) | < | z(c)|

Then z(s) is in the acceptance region, we accept H₀

6 0

3 years ago