If f(x)=4x-20 what is f(4)
2 answers:
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Answer:
D
Step-by-step explanation:
Given a quadratic equation in standard form : ax² + bx + c = 0
We can solve for x using the quadratic formula
x² + 2x + 9 = 0 ← is in standard form
with a = 1, b = 2 and c = 9
x = ( - 2 ± ) / 2
= ( - 2 ± ) / 2
= (- 2± ) / 2)
= (- 2 ± ) / 2
= ( - 2 ± 4i) / 2
= ±
= - 1 ± 2i → D
Answer:
Arla - $15, Kal - $17.5
Step-by-step explanation:
Let $x be Arla's hourly wage and $y be Kal's hourly wage.
1. In the first week on the job they each worked 40 hours and earned $(40x+40y) together. Their total earnings were $1300, so
40x+40y=1300.
2. In the second week on the job business was slow so Arla worked 20 hours and earned $20x, Kal worked 16 hours and earned $16y, $(20x+16y) in total. Their total pool earning was $580, so
20x+16y=580.
3. Solve the system of two equations:
Subtract them:
Then