exam Maths Puzzle Numerical Ability

I tried this problem and did not understand my answer. i would put in my work but some of the terms i need like a fraction line are not on my computer

.5(6-z)=z

Read Solution (Total 0)

exam Other Question

3. The linear equation

y=0.15x + 0.79

represents an estimate of the average cost of gas for year x starting in 1997. The year 1997 would be represented by x = 1, for a stone is dropped from a cliff. In the 4 sec, the sound of the stone striking the ground reaches the top of the cliff. If we assume that the speed of sound is 1100 ft/sec, how high is the cliff?