Please help.
Is algebra.
PLEASE HELP NO LINKS OR FILES.
I don't want links.

Lilianna uses 3/4 calories per minute just by sitting. she uses 1 more calorie per minute by walking. lilianna uses a total of 12 1/4 calories walking to the park. lilianna uses the equation, d(.75+1)=12.25 to represent the situation. what does the variable d represent in the equation?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°