Ryan is buying batteries for his remote control cars. Charge Zone batteries cost $15.80 for 20 batteries. Electrocell batteries cost $8.10 for 10 batteries. If both brands of batteries last equally long, which brand is the better value?

a; x = 0.5

step-by-step explanation:

-10x = -5

x = 0.5

step-by-step explanation:

hello umm i don't understand your question can you explain it more pls

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