Step-by-step explanation:
find 30% of 455
which is = 136.5
then subtract 136.5 from the original number(455)
455 - 136.5
=318.5 student
Answer:
6:1
Step-by-step explanation:
If it's 12:2, then divide it by 2 on each side to get 6:1 or 6
Answer:
(m - n ) = b
mn = c
The relationship between m and n is such that their product is c and their difference is b
Step-by-step explanation:
roots are x = -m and x = n
-m = -b/2 - root(b*b + 4c)/2
n = -b/2 + root(b*b + 4c)/2
(x + m)(x -n) = x*x +(m - n)x - mn
(m - n ) = b
mn = c
20) m∠6 = m∠7 because they are vertical angles.
7x - 24 = 5x + 14
7x = 5x + 38
- Subtract 5x from both sides.
2x = 38
x = 19
- Plug 19 for x into either m∠6 or m∠7.
m∠6 = 7(19) - 24 = 109
m∠6 and m∠7 = <u>109°</u>
<em>__________________________________________________________</em>
21) m∠4 + m∠5 = 90 because they are complementary angles.
(2x - 5) + (4x - 13) = 90
6x - 18 = 90
6x = 108
x = 18
- Plug 18 for x into m∠4 and m∠5.
m∠4 = 2(18) - 5 = <u>31°</u>
m∠5 = 4(18) - 13 = <u>59°</u>