Math
Sarah was given a sum of money. She spent the same amount of money each day. She spent 2/7 of her money in 6 days. After another 5 days, she had $20 left. How much money did she have at first.
mathematic
ans of c ???? is 1 ????
statistics
its wrong :(
statistics
can any one tell me the ans of D plz ???
physic
1. Given the following velocity-time graph: V-T Graph 10 Velocity, m/s 5 10 15 Time -10 a. Calculate the displacement at the end of 20 seconds.
Geometry
A simple graph G has 200000 edges and for any 3 vertices v,w,x, at least one of the edges vw,wx,xv is not present in G. What is the least number of vertices that G can have?
Math
The squares of a 2×500 chessboard are coloured black and white in the standard alternating pattern. k of the black squares are removed from the board at random. What is the minimum value of k such that the expected number of pieces the chessboard is divided into by this ...
Physics
Two point charges +q=1 ìC and −q=−1 ìC with mass m=1 g are fixed at the positions ±r ⃗ 0 with |r 0 |=1 m . The charges are released from rest at t=0 . Find the time ô in seconds at which they collide.
Algebra
What is the largest prime factor of 5^8 +2^2 ?
Calculus help!
Describe the following surface and give traces where available: 16x^2 + 16y^2 - 9z^2 = 0
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