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pogonyaev
3 years ago
13

Do you need a common denominator when multiplying fractions?

Mathematics
2 answers:
Feliz [49]3 years ago
8 0

Answer:

Nope, you just have to multiply across on the top and bottom!

Step-by-step explanation:

Hope this helps! Have a great day C:

ahrayia [7]3 years ago
3 0
The correct answer is yes
You might be interested in
An economist wishes to conduct a survey in two different cities in the same county to determine the difference in the proportion
slamgirl [31]

Answer:

The minimum sample size needed for each city  = 922

Step-by-step explanation:

From the information given:

the objective is to find the minimum sample size needed for each city so that the margin of error not to exceed 6%.

If we take a look at the question very well:

we are only given the confidence interval of 99% and the margin of error of 6%

we were not informed or given the value or estimate of any proportions>

so we assume that:

p_1 =q_ 1= p_2 = q_2 = 0.5

At confidence interval of 0.99 , the level of significance = 1 - 0.99 = 0.01

The critical value for z_{\alpha/2} = z_{0.01 /2}

= z_{0.005} = 2.576

The minimum sample size needed can be calculated by using the formula :

n = \dfrac{z^2_{\alpha/2}}{E^2}(p_1q_1+p_2q_2)

n = \dfrac{2.576^2}{0.06^2}((0.5 \times 0.5)+(0.5 \times 0.5))

n = \dfrac{6.635776}{0.0036}(0.25+0.25)

n =1843.271 \times (0.5)

n = 921.63

n \simeq 922

∴ The minimum sample size needed for each city  = 922

4 0
3 years ago
What is 222,977 rounded to the nearest hundred
sp2606 [1]
223,000 that's the answrs
3 0
3 years ago
Read 2 more answers
Jack and Jill are collecting canned foods for the homeless. They hope to collect 10 cans per day to reach their goal. They have
vredina [299]

B:200 becuase "t" is the variable 10 multiplied by 8 day the days they want to plug into t so 80. 80+120 is 200.

4 0
3 years ago
Bill needs to find the area of the ground covered by a conical tent. The tent is 12 feet tall and makes a 70° angle with the gro
LiRa [457]

To get the area of the cone we need to find the radius first.

tan 70=r/12

r=12tan 70

area of a circle is given by:

A=πr²

thus the area of the ground covered by the tent will be:

A=π(12tan70)²

The answer is  

A] A=π(12tan70°)²

8 0
3 years ago
Find the maximum profit and the number of units that must be produced and sold in order to yield the maximum profit. Assume that
Murljashka [212]

Answer:

185 units

Step-by-step explanation:

Given,

The revenue function is,

R(x) = 4x

Cost function,

C(x) = 0.01x^2 + 0.3x + 4,

Where,

x = number of units produced.

Thus, profit = revenue - cost

P(x) = 4x - ( 0.01x^2 + 0.3x + 4) = -0.01x^2 + 3.7x - 4

Differentiating with respect to x,

P'(x) = -0.02x + 3.7

Again differentiating with respect to x,

P''(x) = -0.02

For maxima or minima,

P'(x) = 0,

-0.02x + 3.7x =0

-0.02x = -3.7

\implies x = \frac{3.7}{0.02}=185

For x = 185,

P''(x) = negative,

Hence, for maximising the profit 185 units must be produced.

3 0
3 years ago
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