okay here is the first one:
2x-4
-------
2
x=6, y-3, z=4
_______________________
square root of 729 = ??
2007-03-06 08:38:19 · 4 answers · asked by Kate 1 in Education & Reference ➔ Homework Help
on the 2 x - z part it is SUBTRACT not negative. sorry 4 the confusion
2007-03-06 08:47:04 · update #1
1st one is wrong because negative 4 take away 2 wouldn't be positive. It be negative. Plus you have to add the x after the answer.
The square root of 729. Well just what's half of it? That's the answer.
2007-03-06 08:43:48 · answer #1 · answered by daisyduke070 2 · 0⤊ 4⤋
1. (2x-4)/2 = x-2 (Divide 2 into 2x and into 4.)
2. I don't understand this one. Was something left out or are these values for another problem. If so and if for #1, then substitute the value 6 for x, thus
x-2 = 6-2=4
3. There is a very long, complicated process for determining square roots that is not even being taught in most advanced match classes, so I can't imagine a 7th grader being expected to do one by hand. Is this one supposed to be an estimate based on trial and error? If so, 25 squared is 625, so it has to be a higher number; 30 squared is 900, so it has to be a lower number. Since we know that the number has to be between 25 and 30, think about these numbers: 25 squared ends up with a number ending in 5; 30 squared ends up with a number ending in zero, so what number between 6 and 9 (because only 26, 27, 28, or 29 can be the answer) when squared ends in 9 (since 729 ends in 9)? Only 7 (7x7=49) meets this requirement, so the answer is 27. You can prove this by calculating 27x27 and it does equal 729.
2007-03-06 08:55:00 · answer #2 · answered by Lillian L 5 · 0⤊ 0⤋
all i am sure is that the square root of 729 is 27...
2007-03-06 09:28:10 · answer #3 · answered by Russian Girl 2 · 0⤊ 0⤋
1. 4 2(6)-4/2=8/2=4
2. 27
2007-03-06 08:47:29 · answer #4 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋