Sandy had Pokemon cards she gave 5 to her friends she now has 4 Pokemon cards left how many Pokemon cards did she have to start with

9

Step-by-step explanation:

X - 5 = 4

9 - 5 = 4

4 + 5 = 9

the answer is d

step-by-step explanation:

y+3=-4(x-2)

y+3=-4x+8

  -3         -3  

y=-4x+5

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this