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salantis [7]
3 years ago
7

In a toothpaste survey,5 of the first 15 people surveyed preferred the same toothpaste.If 30 people will be surveyed altogether,

predict the number of people who will prefer a different toothpaste.Give a reason to support your answer
Mathematics
1 answer:
Gre4nikov [31]3 years ago
8 0

20 people will preferf a different toothpase and 10 people will perfer same.

5 is same and 10 is different.

Total 15 People so that mean if we want to survey 30 people, we will want to 15 x 2. Then that mean result will be duoble.

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Using mixed numbers, write a problem in which an estimate is enough to solve the problem.​
KengaRu [80]

explain:

Estimating Differences of Fractions and Mixed Numbers

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, estimation is a useful way to get an idea of a reasonable solution to a problem. Once you have found an exact answer, you can check your answer against the estimate.When working with fractions and mixed numbers, you can use the fraction benchmarks of 0,

, estimation is a useful way to get an idea of a reasonable solution to a problem. Once you have found an exact answer, you can check your answer against the estimate.When working with fractions and mixed numbers, you can use the fraction benchmarks of 0, 12

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7 0
3 years ago
SURFACE AREAS - PYRAMIDS?
Bond [772]

The total surface area consists of the base area and the surface area (the area of all lateral faces). The base is a hexagon with side a=3 cm.

A_{hexagon}=6A_{triangle}=6\cdot \dfrac{1}{2} \cdot \dfrac{a^2\sqrt{3}}{4} =\dfrac{3}{4} \cdot 3^2\cdot \sqrt{3}=\dfrac{27\sqrt{3}}{4} sq. cm.

Each lateral face is an isosceles triangle with height h=12 cm and base a=3 cm. The area of one such lateral triangle is

A_{lateral}=\dfrac{1}{2}\cdot h\cdot a= \dfrac{1}{2}\cdot 12\cdot 3=18 sq. cm.

Then the total surface area is:

A_{total}= \dfrac{27\sqrt{3}}{4} +6\cdot 18=\dfrac{27\sqrt{3}}{4} +108=11.7+108=119.7 sq. cm.

Answer: 119.7 sq. cm.

7 0
4 years ago
Help. How to solve9d + n = 5r
coldgirl [10]

We want to rewrite the following equation

9d+n=5r

With d as a function of the other terms. Let's start by subtracting n from both sides.

\begin{gathered} 9d+n-n=5r-n \\ 9d=5r-n \end{gathered}

Now, let's divide both sides by 9.

\begin{gathered} \frac{9d}{9}=\frac{5r-n}{9} \\  \\ d=\frac{5r-n}{9} \end{gathered}

And this is our final answer.

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The answer is 3.5 hours.
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