a)0 b)2 c)5 d)-4i know its not -1 or -4 since1 * -1 equals -1 and 2 * -2 equals 4so what is it guys?also, here's a few more questions (yes i know, im stupid)1. a perfect square is the product of any integer and itself. how many perfect squares are factors of 2x4x6x8x10?a) 5 b)4 c)3 d)22. if the circumference of a circle is 4cm, its area is ___cm^2.a) 4/pi b)16/pi c)4pi d)16 pi3. if n is a whole number, which of the following could equal n^3?a) 2.7x10^27 b)2.7x10^28 c)2.7x10^29 d)2.7x10^304. a right triangle can have at most ___ of length 5.a) 3 sides b) 2 sides c) 1 side d) 0 side5. if i add the digits of my phone's extension number, i get 28. the numbers can't have __ digits.a) 3 b)4 c)5 d)7explanations would be nice. (:if you can just answer the most you can, it'd be appreciated.thank you.
assuming youre dealing with the integers first one: i would say 0, but it would appear that a number multiplied by its additive inverse is always negative, which would make 2, 5, both also correct; however, since 0 has no additive inverse, and the only way to multiply a number to get 0 is by 0, i think 0 is the most correct answer. second question: factorize the numbers: nvm got this one wrong, other ppl got it tho. third question: circumference = pi*diameter then 4/pi = diameter = 2*radius. so radius = 2/pi we know area = pi * r^2 = pi * (2^2/pi^2) = 4/pi so the answer is 4/pi fourth question: a or d. you want the third root of the given number to be a whole number, and fractional exponents (third roots of b and c) are not whole number usually... fifth question: 2 sides sixth question: 3 digits. the biggest digit is 9 and 3*9 = 27<28
It never equals 0 because 0 has to be one of the factors and it doesn't have an additive inverse :-) 1. 4,16, and 64 are all perfect squares. I can't think of any others that would be factors of that number. 2. The formula for the area of a circle in number 2 is pi * r^2. Take the radius and square it and multiply by pi. 3. 2.7 x 10^27 is the same as 27 x 10^26. 27 has a cubed root, but 10^26 doesn't. Therefore this is not the answer. 2.7 x 10^28 is the same as 27 x 10^27. Both of these numbers have cubed roots. 2.7 x 10^29 and 2.7 x 10^30 are 27 x 10^28 and 27 x 10^29 respectively. Neither of these have all the terms which have cubed roots. 4. Number 4 you should be able to cut some straws to a length of 5 cm or 5 inches or something. Then experiment with them and see if you can get all three of them to form a triangle (keeping 2 of them at right angles) or if you need one or two or all of them to be shorter or longer. 5. Sorry, can't help you with the last one.
In mathematics, the additive inverse, or opposite, of a number n is the number that, when added to n, yields zero. Ex. 7 + (-7) = 0 but when multiplied together gives you a negative. 7 x -7 = -49 Answer....C
