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Licemer1 [7]
3 years ago
5

Is -2/5 irrational or rational and why???

Mathematics
1 answer:
Levart [38]3 years ago
4 0

Answer:

Rational

Step-by-step explanation:

A rational number is a number expressed as a fraction. So the number could be a decimal or percent.

Hope This Helps :)

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Katy invests a total of $26,500 in two accounts paying 4% and 9% annual interest, respectively. How much was invested in each ac
White raven [17]
A = amount invested at 4%.

b = amount invested at 9%.

we know the total amount invested was $26500, thus a + b = 26500.

whatever% of anything is just (whatever/100) * anything.

how much is 4% of a?  well, is just (4/100) * a, or 0.04a.

how much is 9% of b?  well, is just (9/100) * b, or 0.09b.

we know the interest yielded for both amounts adds up to $1510, thus 0.04a + 0.09b = 1510.

\bf \begin{cases}
a+b=26500\implies \boxed{b}=26500-a\\
0.04a+0.09b=1510\\
----------------\\
0.04a+0.09\left( \boxed{26500-a} \right)=1510
\end{cases}
\\\\\\
0.04-0.09a+2385=1510\implies -0.05a=-875
\\\\\\
a=\cfrac{-875}{-0.05}\implies a=17500

how much was invested at 9%?  well, b = 26500 - a.
7 0
3 years ago
The sum of the ages of a china plate and a glass plate is 16 years. Four years ago the china plate was three times the age of th
sweet-ann [11.9K]
China plate is 12 years (16-4) and Glass plate is 4 years (12÷3)
8 0
3 years ago
Find the slope (7,-2) and (6,-2)
alexgriva [62]
I hope this helps you

7 0
3 years ago
Find the distance between points O and V.-2 and 1/2
inn [45]

This problem is about the distance between points, in this case, we have to unidimensional coordinates, that is, point O is at -2, and Point V is at 1/2.

It's important to know that the proper way to find the distance here is by subtraction, we need to subtract the final points and the initial point. In math, such subtraction is called "differential" or "variation", just a fancy name.

\Delta=\frac{1}{2}-(-2)=\frac{1}{2}+2=0.5+2=2.5

<h2>Therefore, the distance from O to B is 2.5 units.</h2>
3 0
1 year ago
For the data set shown in the scatterplot, what is the BEST approximation of the y-intercept for the line of best fit? A) 0 B) 5
Angelina_Jolie [31]

Answer:

  • C) 125

Step-by-step explanation:

If you add a line of best fit, its extension is likely to intersect the y-axis between 200 and 100 but closer to 100.

The best estimate is choice C) 125

4 0
3 years ago
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