Question

what conjecture can you make about the sum of the first 10 integers

Answer 1

a. the sim is (9*10)/2
b. the sum is (9*10)
c.The sum is (10*11)/2
D. The sum is (10*11)

Answer 2

Do your work!

Add the first ten integers and see what you get. Then figure out the values for a,b,c, and d and see which matches.

This is a great strategy for multiple choice tests, especially the ACT

Answer 3

ok how would i add the integers im so lost!

Answer 4

1+2+3+4+5+6+7+8+9+10

Answer 5

i just dont get it at all :( im so frustrated

Answer 6

can you explain in more depth

Answer 7

please

Answer 8

Sorry, I didn't see the picture...

Can you find the pattern in the right column? The first number is the number of terms, then the second number is one more than that. You multiply then divide by two.

So the sum of the first 10 terms is (10x11)/2

Answer 9

Another example: The sum of the first 8 terms would be (8x9)/2

Answer 10

ok i somewhat get it now, thanks, if your able to i would like to ask more questions

Answer 11

Sure, go ahead

Answer 12

ok great!

Is the following definition of perpendicular reversible? If yes, write it as true bi conditional. Two lines that intersect at right angles are perpendicular.
A.The statement is not reversible.
B.Yes if the two lines itersect at right angles, than they are perpendicular
C. Yes if two lines are perpendicular, then they interstct at right angles
D.Yes;two lines intersect at right angles if (and only i ) they are perpendicular

Answer 13

"if and only if" is the proper phrasing for biconditional statements.

Reversible isn't really a phrase that's commonly used with conditional statements like this. I would probably say that it IS reversible and the correct answer, based upon my above statement, would be (d)

Answer 14

Because it has (and only if in it?

Answer 15

ok im posting another if thats ok but im going to take a picture of it.

Answer 16

and its faster

Answer 17

The "reverse" would be two lines that are perpendicular intersect at right angles.

So, since it is reversible, you must write it as a "biconditional" of which (d) is the only biconditional statement in your answers.

Yes, pretty much because it has "if and only if" in the answer.

Answer 18

Obtuse refers to angles that are greater than 90degrees, NOT greater than 180degrees.

Therefore, answer (d) is the correct choice as the "incorrect statement"

Answer 19

uggh your such a help!! LIFE SAVER ok lets try this one

Answer 20

I can't remember law of detachment.

However, I know that you can NOT make any conclusions based on these statements. The correct answer is NOT POSSIBLE.

Answer 21

ok that makes since. ok next one