13. x= 27/4 or 6 and 3/4
14. x= 27
15. x= 191/7 or 27 and 2/7
16. x= 83/15 or 5 8/15
the key to solving these is cross-multiplying and finding a common denominator, you can use photomath if you want to see the solving steps, hope this helps!
Answer:
Step-by-step explanation:
KE = ½mv²
KE₁₀ = ½(1100)10² = 55000 = 55 kJ
KE₃₀ = ½(1100)30² = 495000 = 495 kJ
9 times greater
Answer:
x=7,1
Step-by-step explanation:
You can always use an app. It is a website that helps all students.
For the answer to the question above,
Let C be CD's
<span>Let D be DVD's </span>
<span>2C + 6D = 156 </span>
<span>C + 9D = 210 </span>
<span>6D = 156 - 2C </span>
<span>3D = 78 - C </span>
<span>C + 9D = 210 </span>
<span>C + 3(78 - C) = 210 </span>
<span>C + 234 - 3C = 210 </span>
<span>234 - 210 = 3C - C </span>
<span>24 = 2C </span>
<span>12 = C </span>
<span>The cost of one CD is $12, so the answer is a.</span>
Answer:$1.4
Step-by-step explanation:4.90 / 3.5 = 1.4 Hope tis helps :)