Math questions

Test Preparation SAT Preparation
1

<p>just checking some of my answers</p>

<p>1) if a, b, and c are positive integers, and if (A-c)b = 0, which of the following must be true
i] a<b
ii] b<c
iii] a=b
iv] a=c
v] b=c (my answer)</p>

<p>2) imgur /uILmJtp.png
in the figure, the pentagon is divided into 3 nonoverlapping triangles.
which of the following is true about the 3 triangles?</p>

<p>i] they have equal areas
ii] the have equal perimeters
iii] they are similar(*)
iv] they are isosceles
v] they each have atleast one angle of measure 60 degrees</p>

<p>3) for all positive integers a and b let @ be define as a@b = a^2 + b^2 - 2.
if c and d are positive integers which of the following CANNOT be the value of c@d?
i] 0
ii] 2
iii] 3
iv] 6
v] 8 </p>

<p>ill add more questions later</p>

2

<h1>1: in order for something that’s being multiplied to equal zero, one of the numbers being multiplied must be zero. In this case, if a were to equal c, as in answer 4, then a-c would equal zero. So the answer is D.</h1>

<h1>2: the link didn’t work, but I guessed on the figure, and the answer would be D. They are isosceles. Two of the angels in each triangle are the same.</h1>

<h1>3: The question states that c and d are positive integers, and therefore must be whole numbers greater than 0, so just by doing different combinations where c and d equal positive integers, you can find that c@d can equal everything but 3. 1@1 equals 0; 2@1 equals 3; 3@1 equals 8; 2@2 equals 6.</h1>