3/10 how do you not know that lolol
Answer:
Step-by-step explanation:
Use the following properties
- (- a)²ᵇ = a²ᵇ
- (1/a)⁻ᵇ = aᵇ
Find the value of the given expression
- (-1/2)⁻⁴ = (- 2)⁴ = 2⁴ = 16
Answer is
<span>d. Step 3: He should have divided both sides by −5.</span>
xy = -20
x + y = 1
x + y = 1
x - x + y = -x + 1
y = -x + 1
xy = -20
x(-x + 1) = -20
x(-x) + x(1) = -20
-x² + x = 20
-x² + x + 20 = 0
-1(x²) - 1(-x) - 1(-20) = 0
-1(x² - x - 20) = 0
-1 -1
x² - x - 20 = 0
x = -(-1) ± √((-1)² - 4(1)(-20))
2(1)
x = 1 ± √(1 + 80)
2
x = 1 ± √(81)
2
x = 1 ± 9
2
x = 0.5 ± 4.5
x = 0.5 + 4.5 or x = 0.5 - 4.5
x = 5 or x = -4
x + y = 1
5 + y = 1
- 5 - 5
y = -4
(x, y) = (5, -4)
or
x + y = 1
-4 + y = 1
+ 4 + 4
y = 5
(x, y) = (-4, 5)
The two numbers that add up to 1 and multiply to -20 are -4 and 5.
Answer:
Step-by-step explanation:
Given
Hamda:
Layla:
Required
Derive an expression for total pay
Represent the number of hours with h.
For Hamda and Layla, their pay for h hours is:
For Hamda, we have:
For Layla, we have:
For h hours, the company will pay:
Collect like terms