Plz help with my math

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

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

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?