Please help me with this it would be very much appreciated

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label?