Answer:
Step-by-step explanation:
1. 5/100*400*2=40
2. 12/100*6000*2=1440
3. 3/100*500*5=75
4. 5/100*2000*4=400
5. 2/100*1200*5=120
The quadratic expression (x+4)² = x² + 8x + 16.
The given expression is,
(x+4)²
The expression (x+4)² represents a mathematical operation called "squaring."
To expand it, we need to multiply the expression by itself.
So, (x+4)² becomes (x+4) * (x+4).
When we multiply these terms, we apply the distributive property and combine like terms.
After simplifying, we get x² + 8x + 16.
Or we can directly use the identity,
(a+b)² = a² + b² + 2ab
Here a = x and b = 4
(x+4)² = x² + 4² + 8x
Hence,
(x+4)² = x² + 8x + 16
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The value of number will be;
⇒ 11
What is an expression?
Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.
Given that;
Bob was thinking of a number between 5 and 15 that when squared and added to 23 equals the next number's square.
Now,
Let the value of number = x
Hence, We can formulate;
⇒ x² + 23 = (x + 1)²
Solve for x as;
⇒ x² + 23 = x² + 1 + 2x
⇒ x² - x² + 23 - 1 = 2x
⇒ 22 = 2x
⇒ x = 22/2
⇒ x = 11
Thus, The value of number will be;
⇒ 11
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Answer:
11
Step-by-step explanation:
(11)² = 121
121+23 = 144
(12)² = 144
The approximate length of the side adjacent to angle is .
Further explanation:
The cosine ratio can be expressed as,
Here, base is the length of the side adjacent to angle and hypotenuse id the longest side of the right angle triangle.
The length of side opposite to angle is perpendicular that is used for the sine ratio.
Step by step explanation:
Step 1:
The observed right angle from the given information is attached.
First determine the hypotenuse and the base of the triangle.
The side is adjacent to angle and the side is the hypotenuse of .
Therefore, the and .
Step 2:
Since, the cosine ratio is .
Now substitute the value and in the cosine ratio.
Therefore, the approximate length of the side adjacent to angle is .
Learn more:
Answer details:
Grade: High school
Subject: Mathematics
Chapter: Trigonometry
Keywords: Distance, Pythagoras theorem, base, perpendicular, hypotenuse, right angle triangle, units, squares, sum, cosine ratio, adjacent side to angle, opposite side to angle.
b. 28.26 square feet
c. 63.61 square feet
d. 254.34 square feet
The area of the circular ring of the fountain with a radius of 9 feet is approximately 254.34 square feet.
To find the area of the ring, we need to subtract the area of the smaller circle from the area of the larger circle. The area of a circle is given by the formula A = πr^2, where r is the radius of the circle. Therefore, the area of the larger circle is π(9^2) = 81π square feet, and the area of the smaller circle is π((9/2)^2) = 20.25π square feet.
Subtracting the area of the smaller circle from the area of the larger circle, we get:
81π - 20.25π = 60.75π
Using the approximation π ≈ 3.14, we get:
60.75π ≈ 60.75(3.14) ≈ 190.845
Therefore, the area of the ring is approximately 190.845 square feet, which is closest to option (d) 254.34 square feet.
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