4 years ago

I need the anwers to these questions:

Mathematics

1 answer:

Alecsey [184]4 years ago

8 0

You solve the first two the same way

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Dave and 6 friends went to dinner. They split the bill evenly. The total for the meal was $84. How much did each friend pay

enyata [817]

Step-by-step explanation:

Dave + 6 friends = 7 friends in total

84 ÷ 7 = 12

Each friend paid $12

4 0

3 years ago

Please HELP!!!!! I need to know the missing value. PLease!!!!!!!!!!!!!!

GuDViN [60]

Answer:

w = 21.4 ft

Step-by-step explanation:

Area of Trapezoid = Area = (a+b)/2 * h

Where a and b are the bases of trapezoid, and h is the height.

In the figure we are given:

a= 32.3 ft

b=w=?

h= 22.9 ft

Area = 614.865 ft²

Putting values in formula

Area = (a+b)/2 * h

614.865 = (32.3 + w) / 2 * 22.9

1229.73 = 32.3 + w * 22.9

1229.73 / 22.9 = 32.3 +w

53.7 -32.3 = w

=> w = 21.4 ft

7 0

4 years ago

A survey found that 89% of a random sample of 1024 American adults approved of cloning endangered animals. Find the margin of er

Kobotan [32]

Answer:

The margin of error for the survey is 0.016

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 1024

Sample proportion:

$\hat{p} = 89\% = 0.89$

We have to find the margin of error associated with a 90% Confidence interval.

Formula for margin of error:

$z_{stat}\times \sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

$z_{critical}\text{ at}~\alpha_{0.10} = 1.64$

Putting the values, we get:

$M.E = 1.64\times (\sqrt{\dfrac{0.89(1-0.89)}{1024}})\\\\M.E=0.016$

Thus, the margin of error for the survey is 0.016

3 0

3 years ago

Systems of equations needs to be solved in substitution form I will give five stars for the answer

Greeley [361]

Answer:

x=2

Step-by-step explanation:

Just copie the picture

6 0

3 years ago

Solve the following equation for x: 6(4x+50)=3(x+8)+3 round to the nearest hundredth

nalin [4]

Answer:

x = -13

Step-by-step explanation:

6(4x + 50) = 3(x+8) + 3

24x + 300 = 3x + 24 + 3

21x + 300 = 27

21x = -273

x = -13

8 0

4 years ago