Answer:
the ration is 2:1 when simplified
The number of students in 5th grade is 60, since 24% of 250 is 60.
Since 90 is 38% if 250, 38 is going to be the percent of all students in sixth grade.
20% of 250 is 50, so the percent of all students in seventh grade is 50.
Finally, 45 is 18% of 250, so 18 percent of all students are in eight grade.
Hope this helped :)
Answer:
-3
Step-by-step explanation:
you start with the parentheses -16-9 turns into -16 + (-9)
and then you try to solve everything.

<h3>Further explanation</h3>
We will calculate the unit conversion factor used to convert its engine displacement from cubic-centimeters to cubic-inches.
The relationships between inch and cm are as follows:

Inches and cm represent units of length.
Made into fractions, 1 inch as the denominator and 2.54 cm as the numerator.

As a unit conversion factor of volume, the numerator and the denominator in cubic.


Thus, we get the unit conversion factor

Let's use this unit conversion factor to calculate its engine displacement in new units.

Note for cm³ units that have been crossed out.
The conversion result is 
<h3>Learn more</h3>
- Convert cubic-kilometers to cubic-meters brainly.com/question/1446243
- How to write in scientific notation brainly.com/question/7263463
- Calculating mass based on density and volume brainly.com/question/4053884
Keywords: the motorcycle engine, Kawasaki Ninja 1000, 1043 cubic-centimeters (cm³), to calculate, its engine displacement, in cubic-inches (in³), what unit conversion factor
Givens
D = 621 miles
r = 51.75
t = ?
Formula
d = r * t
Solve
621 miles = 51.75 * t Divide by 51.75
621 / 51.75 = t
t = 12 hours.
Answer B