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Two students are provided with a starting pistol, a stopwatch and a long measuring tape. The starting pistol produces a loud sound and a puff of smoke. Describe how the students use the apparatus to calculate the speed of sound.

The students stand at a distance of 200 m from each other (measured with the measuring tape). Student 1 fires the pistol, Student 2 starts the stopwatch when they see smoke from the pistol and stop it when t...
JM
Answered by Josh M. • Physics tutor
15739 Views

State the nth term of the following sequence: 3, 7, 11, 15, 19

First we look at the jump between each term:7-3=4, 11-7=4, 15-11=4, 19-15=4So we know that the difference in each step is 4. So our expression with look like 4n+d for some number d.Comparing what we have wit...
HD
Answered by Huw D. • Maths tutor
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x^2-9x+20=0

x 2 -9x+20=0x 2 -5x-4x+20=0x(x-5)-4(x-5)=0(x-4)(x-5)=0x-4=0x=4x-5=0x=5
GL
Answered by Georgia L. • Maths tutor
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Solve these simultaneously to find values for a and b: 6a + b = 16 and 5a - 2b = 19

In order to tackle questions like this with two letters of unknown value, first what we try to do is eliminate one of the variables completely from an equation. If we call 6a + b = 16 eqn 1 and 5a - 2b = 19 ...
MP
Answered by Malvika P. • Maths tutor
5461 Views

write a description of the town you are from

J’habite à Londres, qui est la capitale du Royaume Uni et qui se trouve au sud du pays. Londres est une des plus grandes villes du monde, avec environ 12 million d'habitant. C’est une ville très diverse, ave...
RK
Answered by ROXANA K. • French tutor
2504 Views