Please help me im deperate Pre algebra and algebra one?

Question

1.irrational numbers can become rational by dropping a few decimal places
a.true
b.false

2.triangular numbers are created by adding consecutive counting number
a.true
b.false

3.integers are not natural numbers
a.true
b.false

4.change equations,x-y=4 to form y=mx+b
a.x-4=y
b.-y=4+x
c.y=x-4
d.y=x+4

5.express statement as an equality and state whether the solution is open or closed. carpeting the room could cost as much as $1000.

a.c<$1000;open
b.c>$1000;closed
c.c<$1000;open (the less sign should have an underline under it)
d.c>$1000;open (the greater sign should have an underline under it)

6.parallel lines when crossed b transversal create
a. congruent angles
b.acute angles
c.alternative angles
d.right angles


7.a school sent 5 students to the spelling bee. the team was made of 4 people.how many combinations could u make up?

a.80
b.30
c.120
d.60

Answer 1

1). False. You have to drop infinitely many decimal places.
2). True. 1 + 2 + ...+ n = n(n+1)/2 is the nth triangular number.
3). True. Positive integers are natural numbers,
but not nonpositive integers.
4). c). y = x-4. Solve the equation for y.
5). c). The cost is less than or equal to $1000.
6). a). Congruent angles. If 2 parallel lines are
cut by a transversal, corresponding angles are
congruent. There is no such thing as
"alternative angles". There are alternate
interior angles and alternate exterior angles.
7). c). 5*4*3*2 = 120

Answer 2

1. false, since irrational numbers cannot be represented by a finite sequence.

2. true. Triangular numbers are 1, 3 (=1+2), 6 (=1+2+3), ...

3. integers (all whole numbers) are a superset of the naturals (positive whole numbers). So the two sets are not equivalent. However, there are plenty of individual integers that are natural numbers.

4. Come now, if you can't do that, you need to go do your homework. You just need simple algebra. Add or subtract the same amount to both sides of the equation until you get it in the right form.

5. The answer is cost <= $1000 and it's closed. (<= is how you type < with an underscore on the computer since it means "less than or equal to").

6. alternate angles. You need to understand what each of those words mean and work out if you're guaranteed to get them by intersecting the parallel lines with another line. For example, you might get right angles, but that's not guaranteed.

7. Oops, I've forgotten why this one works. The formula is nCr = n (n-1)... (n-r+1) / r (r-1) ... 1. In this case it's 5x4x3x2 / 4x3x2x1. You can calculate the answer.

Answer 3

False. An irrational number is always irrational and has an infinite number of decimal places. Dropping a few places does nothing to chang its irrationality.

False. The 1st five triangular numbers are 1 3 6 10 15

y= x-4

c

All of the answers are possible.

5*4*3*2 = 120

Answer 4

nicely first, you are going to ought to do some simplifying! (non-compulsory, i think of. in spite of if it makes it extra straightforward :) ) so which you will characteristic the like words, that are numbers that are the comparable so..7d and 2d, -12 and 3. First, 7d + 2d = 9d, so then the present equation might now be this : 9d -12 +3 = 18. Now upload -12 + 3. -12 + 3 = -9. cutting-edge equation: 9d - 9 = 18. NOW, you need to do opposite operations. EX) 2x = 7. subsequently, you may divide by ability of two, because of the fact the different of 2x is divide. 9d - 9 = 18. = 9d = 27. Divide the two aspects by ability of 9, d = 3. +9 +9 Sorry, that is relatively puzzling yet you will get the carry of it lol.

Answer 5

1)b.false

2)b.false
3)a.true
4)c.y=x-4
5)c.c<$1000;open (the less sign should have an underline under it)
6)c.alternative angles
7)