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MariettaO [177]
3 years ago
7

A fraction equivalent to 3/8with denominator 20 is​

Mathematics
1 answer:
Sophie [7]3 years ago
4 0
9/20 I’m pretty sure


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A collection of quarters and nickels is worth $13.70. There are 106 coins in all.
LiRa [457]
We make two sets of equations: x + y = 106 and 0.05x + 0.25y = 13.70. I will solve by substitution. Subtract "x" from both sides of x + y = 106 to convert it to slope intercept form, so y = 106 - x. Substitute y = 106 - x into 0.05x + 0.25y = 13.70, so 0.05x + 0.25(106 - x) = 13.70. Solve for 0.05x + 0.25(106 - x) = 13.70, so 26.5 - 0.2x = 13.7, then x = 64. Substitute 64 into x + y = 106, so 64 + y = 106, then y = 42. There is 64 nickels and 42 quarters.
4 0
4 years ago
The cost to a store for a box of cereal is $2.50. The store is selling the box of cereal for $3.50. What is the percent of marku
zysi [14]
Well, the cereal cost 2.5, and the store is selling for 3.5, so is 1 buck more.

if we take 2.5 to be the 100%, what is 1 off of it in percentage?

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
2.5&100\\
1&p
\end{array}\implies \cfrac{2.5}{1}=\cfrac{100}{p}\implies p=\cfrac{1\cdot 100}{2.5}\implies p=\stackrel{\%}{40}
8 0
4 years ago
Someone help me please
Keith_Richards [23]

Answer:

144 tiles

Step-by-step explanation:

if the room is 144 feet squared and one tile is one square foot

6 0
3 years ago
Name the geometric solid suggested by a basketball
Olin [163]
Sphere, the answer is a sphere

8 0
3 years ago
Jake is studying a small insect population for his science fair project. In the mornings before school he records the insect pop
Masja [62]

Using it's concept, it is found that the average rate of change of this function over the interval of time from 30 days to 60 days is of 0.4 insects per day.

<h3>What is the average rate of change?</h3>
  • The <em>average rate of change</em> of a function f(x) over an interval [a,b] is given by the <u>change in the output divided by the change in the input</u>, that is:

A = \frac{f(b) - f(a)}{b - a}

In this problem:

  • The inputs are of 30 and 60 days, hence a = 30, b = 60.
  • At day 30, there are 20 insects, hence f(a) = 20.
  • At day 60, there are 32 insects, hence f(b) = 32.

Then:

A = \frac{32 - 20}{60 - 30} = 0.4

The average rate of change of this function over the interval of time from 30 days to 60 days is of 0.4 insects per day.

You can learn more about the average rate of change at brainly.com/question/25775946

5 0
3 years ago
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