Answer:
i think two i may be wrong
Step-by-step explanation:
Answer:
Breadth = 8 cm
Length = 17 cm
Step-by-step explanation:
Given rectangle:
Breadth = x cm
Length = x + 9 cm
Area = length * breadth
= x * (x + 9)
= x² + 9x
Rectangle with length and breadth increased:
Breadth = x + 3 cm
Length = x + 9 + 3 = x + 12 cm
Area = 84 + (x² + 9x) cm²
(x +3) * (x +12) = 84 + x² + 9x
Use FOIL method
x*x + x*12 + 3*x + 3*12 = 84 + x² + 9x
x² + 12x + 3x + 36 = 84 + x² + 9x {add the like terms}
x² + 15x + 36 = 84 + x² + 9x
x² + 15x + 36 - 84 - x² - 9x = 0
6x - 48 = 0
6x = 48
x = 48/6
x = 8
Breadth = x = 8 cm
Length = x + 9 = 8 +9 = 17 cm
2. Is balanced, 3. Is unbalanced, 4. Is balanced. We need the same number of each element on both sides. The reason why 3. Is unbalanced is becauase we have 2N and 2H on the left, but only 1N and 6H on the right. If you have an expression like 3H2, this is 3 H2 molecules, meaning 6 H molecules total.
Answer:
Step-by-step explanation:
Since we are not given the dimension. Let us say the shape of the patio is a rectangle with length 30m and width 18m.
Area of the rectangle = Length * Width
Area of the rectangle = 30 * 18
Area of the rectangle = 540m²
This means that 540m² of the patio costs $2276.35. To get the cost of each square metre of patio, we will say;
540m² = $2276.35
1m² = x
cross multiply;
540x = $2276.35
x = $2276.35/540
x = $4.22
Hence each square meter of patio will cost $4.22
<em>Note that the dimension of patio was assumed. Same explanation can be employed for any dimension.</em>
-2/3 is the simplified form of the expression -1/2 ÷ 3/4.
<h3>What is the simplified form of the given expression?</h3>
Given the expression in the question;
-1/2 ÷ 3/4
To divide by a fraction, multiply by its reciprocal.
-1/2 ÷ 3/4
Reciprocal of 3/4 is 4/3
Hence
-1/2 × 4/3
Next, we cancel out the common factor of 2
Factor out 2 from 4
-1/2 × 2(2)/3
-1/1 × 2/3
( -1 × 2 ) / ( 1 × 3 )
(-2) / (3)
-2/3
Therefore, the simplified form is -2/3
Learn how to solve more fraction problems here: brainly.com/question/1627825
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