For a, 7/-8 and -(7/8) are both equivalent to -7/8 because they have 1 negative sign. It doesn't matter where it is on the fraction as long as there is only 1 negative sign.
For b, -2/-3 is equivalent to 2/3 because the double negatives cancel each other out to equal a positive.
H = m/y + z/y - d
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Answer: The contribution to geometry is attributed to the work of René Descartes B. the use of functions to describe lines and curves.
Who is Rene Descartes?
Rene Descartes is a famous person known for his great contribution to Mathematics and Philosophy.
He is also called the "Father of Modern Philosophy".
One of the major ways in which the French philosopher René Descartes contributed to geometry was through his mathematical skills and progress, which allowed scientists to better quantify and analyze data.
The contribution to geometry is attributed to the work of René Descartes B. the use of functions to describe lines and curves.
Step-by-step explanation: