10*30=300
10*4=40
6*30=180
6*4=24
add them up: 300+40+180+24=544
15$ I believe, as we can disregard the two original books (they have been payed for) leaving her to buy 1 book and having seven dollars, however if she needs $8 more you simply need to add 8+7.
N(75/100)=4.5 multiply both sides by 100
75n=450 divide both sides by 75
n=6cm
Answer:
Factor out 3 from the first two terms
Step-by-step explanation:
