Answer:
i think its b but im not that sure
Step-by-step explanation:
Answer:
b. BC
Step-by-step explanation:
The first thing is to calculate the dimensions of each matrix, that is, the number of rows x number of columns:
dimensions of A: 2x2
B dimensions: 2x3
C dimensions: 3x3
D dimensions: 1x3
We have that a matrix multiplication is defined, the internal numbers of its dimensions must be the same: we analyze each option:
BA: (2x3) * (2x2): the internal numbers do not match (a 3 for B and a 2 for A), so the multiplication of the matrix is not defined
BC: (2x3) * (3x3): the internal numbers are both 3, so the matrix multiplication is defined
CB: (3x3
) * (2x3): the internal numbers do not match (a 3 for C and a 2 for B), so the multiplication of the matrix is not defined
CD: (3x3) * (1x3): the internal numbers do not match (a 3 for C and a 1 for D) so the multiplication of the matrix is not defined
Therefore the answer is b. BC
Answer:
2. 5
3. 302
Step-by-step explanation:
2. -8/(4)+7
-8/4 = -2
(-2)+7
5
3. 2-5(3-7(9))
(3-7(9)) = -60
2-5 = 2+(-5)
2 + (-5)(-60)
2+(300)
302
First, multiply the top layer. 9 times 8 is 72.
now multiply the next layer. its not 15 times 20. its 7 times 20. remember the 9 times 8? well the 8 is a part of the 15. 15-8 is 7. 7 times 20 is 140. now add 140 and the 72 from the beginning. 140+72 is = to 212. please give me THE BRAINLIEST ANSWER.
