The solution x=7 is a solution to which of the following equations? check all that apply x+54=31 23+x=40 -21=x+(-38) 8=x+1 i think its a and d tell me if i am right or wrong

The frequency table shows the results of a survey comparing the number of beach towels sold for full price and at a discount during each of the three summer months. the store owner converts the frequency table to a conditional relative frequency table by row. which value should he use for x? round to the nearest hundredth. 0.89 0.90 0.92 0.96