Life is Struggle — Fight it.
Joined August 2018
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1. An instrument store gives a 10% discount to all students off the original cost of an instrument. During a back to school sale an additional 15% is taken off the discounted price. Julie, a student at the local high school, purchases a flute for $306. How much did it originally cost?
A. $325
B. $375
C. $400
D. $408
E. $425
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Do you know: South Africa's 🇿🇦 nominal GDP is estimated at $489.08 billion (with a Purchasing Power Parity or PPP GDP of $1.08 trillion) according to International Monetary Fund (IMF) DataMapper projections.
Key Economic Indicators:
• Nominal GDP: $489.08 billion
• GDP (PPP): $1.08 trillion
• GDP Growth Rate: ~1.0% (2026)
• GDP per Capita (Nominal): ~$7,660
• GDP per Capita (PPP): ~$16,840
• Global / Regional Rank: 38th globally in nominal GDP and remains the largest economy in Africa.
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Do you know that the book named: "Six Math Essentials" is one of the standout #Mathematics books published in 2026, alongside notable academic and competitive titles released this year.
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Mastering the basics of calculus: The Leibniz Theorem (also known as the Product Rule) breaks down how to find the derivative of two multiplied functions.
The Product Rule of Differentiation, which is labeled here as "Leibniz Theorem".
It shows how to find the derivative of two functions multiplied together.
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The midpoint formula finds the exact center point (or average position) of a line segment between two points in a coordinate plane.
Mathematiic! retweeted
The Principle of Least Action (also known as Hamilton's Principle), which states that the true path a physical system follows through space & time is the one that makes its physical action 'S' stationary compared to all other imaginable paths between the same start & end points.
It mathematically connects how far a planet is from its star to the exact time it takes to complete a full orbit (T² = a³).
Farther planets move much more slowly and take vastly longer to orbit than inner planets.
Mathematiic! retweeted
An upper triangular matrix is a square matrix where all entries below the main diagonal are equal to zero.
