There are 10 marks between 7 and 8, therefore each mark is equivalent to 0.1
For 8.3, count 3 marks after 8:

First convert the fraction into decimal. Then count 6 marks from 7:
31/40
Step 1: .775= 775/1000
Step 2: 775/1000= 31/40
Answer:
(-4,-5)
Step-by-step explanation:
(x,y)... always x-axis first and then y-axis
Answer:
x=2
Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable :)
Answer:
x = 13
Step-by-step explanation: