9.
They are: 59, 61, 67, 71, 73, 79, 83, 89 & 97.
Use photo math to help you with this question
A triangle with sides measuring 300, 400 and 700 because 300+400+700=1400 which is higher than the first triangle 300+400+500=1200
Subtract thats how you get it
On the bottom left, the answer is subtraction property of equality because you need to subtract 4x to the 7x to simplify the equation.
