An instrument store gives a 10% discount to all students off the original cost of an instrument. During a back to school sale an additional 15% is taken off the discounted price. Julie, a student at the local high school, purchases a flute for $306. How much did it originally cost? A. $325 B. $375 C. $400 D. $408 E. $425
C. The equation, x-0.10x-0.15(x-0.10x)=306, may be used to solve the problem. Solving for x gives 0.90x - 0.15x + 0.015x = 306, where x = 400. Thus, the original price was $400.
<figure> <picture> <source media="(min-width: 40em)" srcset="large.jpg 1024w, medium.jpg 640w, small.jpg 320y"> <img src="medium.jpg" alt="London by night"> </picture> <figcaption>A landscape of London by night</figcaption> </figure> Is it valid? If not, why?
The markup uses the picture element, which is a pretty new addition to the specification. The code is all valid apart from the last image specified in the srcset attribute; 320y isn’t a valid value. If the y is replaced with a w, it becomes valid though.
Why do we need to study history?
The past causes the present, and so the future.