Answer:
![\large \boxed{\text{Q31, D. 6.00 F; 32. C. N21.75; Q33. A. 168.00 F}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/l8roz7tjr44wfd1g80c6e13fhith14b4e7.png)
Explanation:
Your graph is hard to read, so I re-drew it as best I could.
You must first develop an equation relating francs and naira.
The line goes through the origin, so the general equation is
y = kx
One of the points is (40,240).
![\begin{array}{rcl}F & = &k * N\\240 & = &k * 40\\k & = & (240)/(40)\\\\k&=&\textbf{6 F/N}\\\end{array}\\\text{The equation is $\large \boxed{\mathtbf{F = 6 N}}$}](https://img.qammunity.org/2021/formulas/mathematics/high-school/yhw3bnqzqkyb7chl9ipl8u2lvutqxz88pj.png)
Q 31.
![\begin{array}{rcl}F & = &6N\\& = & 6 * 1.00\\& = & \mathbf{6.00}\end{array}\\\text{The equivalent value of N1.00 is $\large \boxed{\textbf{6.00 F}}$}](https://img.qammunity.org/2021/formulas/mathematics/high-school/2804xc5kdv7zvlsoislc1914p2hulccd1k.png)
Q 32.
![\begin{array}{rcl}F & = &6N\\130.5& = & 6 N\\N&=& (130.5)/(6)\\\\& = & \mathbf{21.75}\\\end{array}\\\text{The equivalent value of 130.5 F is $\large \boxed{\textbf{N21.75}}$}](https://img.qammunity.org/2021/formulas/mathematics/high-school/jre3f0g0x3frcr6vf9og6w19xik1n6f86t.png)
Q 33.
![\begin{array}{rcl}F & = &6N\\& = & 6 * 28.00\\& = & \mathbf{168.00}\end{array}\\\text{An amount of N28.00 is $\large \boxed{\textbf{168.00 F}}$}](https://img.qammunity.org/2021/formulas/mathematics/high-school/8rp8o8t2lvlh95y7czy6tzoqltqo075xft.png)