Square root of 225 divided by 13 minus 8 plus 3 to the second power plus square root of 81 minus square root of 1 to the second power

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

Susie wants to take her friend out for lunch. she wants to spend $9.75 each person. how much will she spend in all.