Answer:
B
Step-by-step explanation:
2/3 ÷ 1/6
=2/3 × 6/1
sorry if I got it wrong
Answer:
- - 2x² + x + 4
- 2x² + x + 4
- 3
Step-by-step explanation:
<u>Given functions</u>
<u>Finding (r-s)(x), (r+s)(x), (r*s)(-1)</u>
- (r - s)(x) = r(x) - s(x) = x + 4 - 2x² = - 2x² + x + 4
- (r + s)(x) = r(x) + s(x) = x + 4 + 2x² = 2x² + x + 4
- (r*s)(-1) = r(-1)*s(-1) = (-1 + 4)*(-1)² = 3*1 = 3
Answer:
Step-by-step explanation:
We can let b and c represent the cost of a book and the cost of a CD, respectively. Then the purchases can be described by ...
3b +7c = 79
5b +2c = 35
Using Cramer's rule to find the solution, we have ...
b = (7(35)-2(79))/(7(5) -2(3)) = 87/29 = 3
c = (79(5)-35(3))/29 = 290/29 = 10
The cost of each book was $3; the cost of each CD was $10.
_____
Cramer's rule tells you the solution to ...
ax +by = c
dx +ey = g
is ...
x = (bg -ec)/(bd -ea)
y = (cd -ga)/(bd -ea) . . . . same denominator
This solution is fully equivalent to using elimination or substitution to solve the problem. Using these formulas effectively "cuts to the chase" without all the intermediate steps. The cross-multiplying pattern of differences is not hard to memorize.
Answer:
1.08
Step-by-step explanation:
This is because it grows upon itself so it starts with a multiplier of 1, but it is growing with .08 (8 percent) on itself so you add these two numbers together to get 1.08
Subtract 6 from both sides
-2y = -18
Divide by -2
Solution: y = 9