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(10 plus x) x 21 divided by 2 equals 367.5. The area of a right triangle is 9.6 square meters, and its height is 3 meters

(10 plus x) x 21 divided by 2 equals 367.5. The area of a right triangle is 9.6 square meters, and its height is 3 meters

(10+x)×21÷2=367.5
(10+x)×21=735
10+x=35
x=35-10
x=25
Set the bottom as X meters
x×3÷2=9.6
x×3=19.2
x=6.4

When n is equal to, the result of (10-8n) △ 2 is 0

0÷2=0
So 10-8n = 0
-8n=-10
n=-10/8=-5/4

(10-8n) △ 2, when n is equal to what, the result of the formula is O, is 1?

(10-8n)÷2=0
be
10-8n=0
Then n = 5 / 4
(10-8n)÷2=1
10-8n=2
8n=8
n=1