Answer:
x=31
Step-by-step explanation:
take the square root of both sides to get the answer
We have been given that Alexis received an 85, 89, and 92 on three tests and we are asked to find out the minimum grade Alexis can score on the fourth test in order to have an average of at least 90.
Let x be marks Alexis can score on the fourth test.
Since we know average is sum of all the numbers divided by number of items. Now we can set our given information in the average formula to get the minimum numbers Alexis can score on the fourth test.
![\frac{85+89+92+x}{4}=90](https://tex.z-dn.net/?f=%5Cfrac%7B85%2B89%2B92%2Bx%7D%7B4%7D%3D90)
![85+89+92+x=4\cdot 90\\266+x=360\\x=360-266=94](https://tex.z-dn.net/?f=85%2B89%2B92%2Bx%3D4%5Ccdot%2090%5C%5C266%2Bx%3D360%5C%5Cx%3D360-266%3D94)
Therefore, the minimum grade Alexis can score on the fourth test is 94, in order to have an average of at least 90.
WHO HAS THE ANSWER!! I DONT GET IT. PLEASE COMMENT THE ANSWER ON MY POST
Answer:
.545454545
Step-by-step explanation:
I used my calculator for it I am terribly sorry if it's wrong
-25 is an integer and a rational number.
<h3>What is number system?</h3>
- A system of writing numbers is known as a number system.
- It is the mathematical notation for consistently employing digits or other symbols to represent the numbers in a particular set.
- It represents the arithmetic and algebraic structure of the numbers and gives each number a distinct representation.
Now,
- Natural numbers are positive integers with a range of 1 to infinity; nevertheless, they do not include zero. -25 wouldn't be a natural number because it is a negative number.
- A group of numbers known as a whole number consists of all positive integers and 0. This wouldn't be a whole number because -25 isn't a positive number.
- Any real number that cannot be represented as the quotient of two integers is said to be irrational. Square roots of irrational numbers are also frequently seen. -25, however, is not a square root.
- Any number that can be expressed as a ratio, or a fraction, of two integers, is referred to be a rational number. Fractions, decimals, negative decimals, and other rational numbers are very prevalent. Since -25 can be represented as a ratio of two numbers. it is a rational number.
- A whole number that can be either positive, negative, or zero is known as an integer. As -25 is negative and a whole number( when positive), it is an integer.
Hence, -25 is an integer and a rational number.
To learn more about number system, refer to the link: brainly.com/question/13162939
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