You put $10,000 in a simple interest account at a bank. You will earn $1,800 in just 4 years. What is the annual interest rate for the account?
CLEAR CHECK

4.5%

1.8%

22.2%

3.125%

nswer: a   y-axis

step-by-step explanation:

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629