Answer:
x = 80°
Step-by-step explanation:
Angle on a straight line = 180°
(x + 40)° + (x - 20)° = 180°
x + 40° + x - 20° = 180°
2x + 20° = 180°
2x = 180° - 20°
2x = 160°
x = 160°/2
x = 80°
Check:
(x + 40)° + (x - 20)° = 180°
(80° + 40°) + (80° - 20°) = 180°
120° + 60° = 180°
180° = 180°
Unit digit=y
tens digit=x
the number: 10x+y
We suggest this system of equations:
x+y=7
(10y+x)=(10x+y)+9
we solve it by substitution method.
x=7-y
10y+(7-y)=(10(7-y)+y)+9
9y+7=70-10y+y+9
9y+10y-y=70+9-7
18y=72
y=72/18=4
x=7-y
x=7-4=3
number=10x+y=10*3+4=30+4=34
solution: the number: 34
To check:
3+4=7
43=34+9
Answer:
The triangles are not similar
Step-by-step explanation:
Answer:
$115 - $48 = $67 Alberto has $67
Solution
1) <span>Simplify <span><span>−5n−4n</span></span> to <span><span>−9n</span></span>
</span><span><span>−9>−9n
</span></span>
2) <span>Divide both sides by <span><span>−9</span></span>
</span><span><span>1<n
</span></span>
3) <span>Switch sides
</span><span><span>n>1</span></span>
