The force of repulsion, F newtons (N), between two particles is inversely proportional to the square of
the distance, d m, between the particles.
(i) Write down a formula connecting F and d.
(ii) When the particles are a certain distance apart,
the force of repulsion is 20 N. Find the force
when the distance is halved.

Jonathan pays $1.90 per pound for potatoes. he buys 8.3 pounds of potatoes. he determines that he will pay $15.77, before tax, for the potatoes. which best describes the reasonableness of jonathan’s solution? jonathan’s answer is reasonable because there are two decimal places in the factors and two in the product. jonathan’s answer is unreasonable because there are three decimal places in the factors and two in the product. jonathan’s answer is reasonable because is 16, and 16 is close to 15.77. jonathan’s answer is unreasonable because is 8, and 8 is not very close to 15.77.

Enter the missing numbers in the boxes to complete the table of equivalent ratios.time (min) distance (km)? 36 9? 1512 ?

What is the point slope form of a line with slope -5 that contains point (2,-1)