x = 1.01
Explanation:
Given equation: 
    y = 1.2345x – 0.6789
    y = 0.570
Problem: 
Solving for x
The variables in this equation are y and x
They can take up any value since they are variables. 
   Since we have been given y = 0.570
          y = 1.2345x – 0.6789
To solve for x, we simply substitute for y in the equation; 
      since  y = 0.570
      0.57 = 1.2345x – 0.6789
     add 0.6789 to both sides; 
  0.57 + 0.6789 =  1.2345x – 0.6789 + 0.6789 
   1.2489 =   1.2345x 
Divide both sides by  1.2345
   
 
     x = 1.01
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Answer:
B. Ca2+ import into the ER because it has the steeper concentration gradient
Explanation:
ΔGt =  RT㏑(C₂/C₁)
where ΔGt is the free energy change for transport; R = 8.315 J/mol; T = 298 K; C₂/C₁ is ratio of concentrations inside and outside each organelle.
For Ca²⁺ import
ΔGt = 8.315 J/mol * 298 K * ㏑(10⁻³/10⁻⁷)
ΔGt= 3.42 kJ/mol
For H⁺ import
ΔGt = 8.315 J/mol * 298 K * ㏑ (10⁻⁴/10⁻⁷)
ΔGt = 2.73 kJ/mol
From the above values, ΔGt is greater for Ca²⁺ import because it has a steeper concentration gradient