Gayle bought a shirt that was originally marked as $18. She had a coupon to receive 15% off the price. Gayle had to pay 7.5% sales tax on her shirt. What price did Gayle pay for the shirt?

$16.45

Step-by-step explanation:

18 decrease 15% =

18 × (1 - 15%) = 18 × (1 - 0.15) = 15.3

15.3 increase 7.5% =

15.3 × (1 + 7.5%) = 15.3 × (1 + 0.075) = 16.4475

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

there is no answer sorry!

step-by-step explanation: