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4 years ago

I really need help Can someone help me

Mathematics

1 answer:

denis-greek [22]4 years ago

6 0

The answer is 3.800 because you round up

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ATOR

katrin2010 [14]

Answer:

6 adults

Step-by-step explanation:

Let

x -----> the number of children

y ----> the number of adults

we know that

The ratio

$\frac{x}{y}=\frac{20}{15}$

using proportion

Find the value of y for x=(20-12)=8

$\frac{20}{15}=\frac{8}{y}\\\\y=15*8/20\\\\y=6$

therefore

6 adults

4 0

3 years ago

What is four times the difference of -15 and 7 amounts to -88

Crazy boy [7]

Answer:

-1

Step-by-step explanation:

4(-15-7)x= -88

4(-22)x= 88x=-88

x=-1

3 0

3 years ago

Addison sells plants. She sold 7 times as many as tomato plants as pepper plants, for a total of 64 plants sold. How many pepper

s344n2d4d5 [400]

She sold 8 pepper plants.

From this problem I made the equation
7p+p=64

I knew that it needed to be 7 times however many pepper plants she sold, so I substituted p until it equaled 64.

7*8+8=64
56+8=64
64=64

So she sold 8 pepper plants and 56 tomato plants for a total of 64 plants.

7 0

3 years ago

Read 2 more answers

Anyone know how to do this one? 2x+7y=-1 4x-3y=-19

nlexa [21]

2x+7y=-1 (1)
4x-3y=-19 (2)

multiply equation (1) by 2
4x + 14y = -2 (1')
4x - 3y = -19 (2)
---------------------subtract
17y = 17
y = 1

2x+7y=-1
2x+7(1)=-1
2x + 7 = -1
2x = -8
x = -4

answer
(-4, 1)

7 0

4 years ago

Suppose 223 subjects are treated with a drug that is used to treat pain and 50 of them developed nausea. Use a 0.01 significance

Colt1911 [192]

Answer: We reject the null hypothesis.

Step-by-step explanation:

Since we have given that

n = 223

Number of subjects developed nausea = 50

$\hat{p}=\dfrac{50}{238}=0.21$

We need to claim that more than 20% of users develop nausea.

So, Hypothesis:

$H_0:p\leq 0.20\\\\H_a:p$

test statistics would be

$z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}\\\\z=\dfrac{0.21-0.20}{\sqrt{\dfrac{0.2\times 0.8}{223}}}\\\\z=\dfrac{0.01}{0.0268}\\\\z=0.373$

At 0.10 level of significance, z = 1.28

Since 0.373<1.28 so, test statistic is less than critical value.

Hence, we reject the null hypothesis.

5 0

3 years ago