Answer: 25 adults, 50 children and 96 students
Step-by-step explanation:
12x + 5*(2x) + 7*(171-3x) = 1222
12x + 10x + 1,197 - 21x = 1222
x = 1222 - 1,197 = 25 is the number of adults.
2*25 = 50 is the number of children
50*5 = 250
25*12 = 300
300+250 = 550
1222-550 = 672
672/7 = 96
Answer:
129.9 cm^2
Step-by-step explanation:
You can use the Law of Sines to find the hypotenuse. Because it's an equilateral triangle, it's the same value for the base. If you plug in the proper angles, being 90 degrees and 60 degrees because it's an equilateral triangle, the value of the base should be 17.32050808, or 17.32 if we're rounding. If you use the usual formula for finding the area of a triangle, b * h / 2 to get an answer of 129.9 cm^2. Hope this helps and isn't too confusing! There's a bunch of lessons on Khan Academy if you need more help!
This is a bit advanced for middle school, so we might be missing some information.
Answer:
45
Step-by-step explanation:
the middle line is at 45
17.09
Do 6^2 + 16^2
which is 292
now get the square root of that... 17.088
now round to the hundred like they want...
17.09
Answer:
B. √5
Step-by-step explanation:
Given:
<h2>
</h2>
Rewrite 9 as 5 + 4:
Rewrite 5 as (√5)², 4 as 2² and 4√5 as 2 · 2√5:
Apply the perfect square formula :
Apply radical rule
Simplify: