Answer:5.4×105+2.3×104.
Step-by-step explanation:
Answer:
the answer is 100
Step-by-step explanation:
6+12= 18
6+6+6=18
18-4=14
Explanation:
Before he was 6.
So 6+12 would give us 18 which will be his age after 12 years.
and 3 times 6 equals 18
we want to know what the current age was so
we subtract 18 - 4 which is equal to 14
Answer:
x = -3
Step-by-step explanation:
y = -x + 2
7x + 4y = -1
Subsitution method: (Substitute y)
7x + 4(-x+2) = -1
Expand.
7x + (-4x + 8) = -1
One plus and one minus make one minus. Two plus makes a plus.
7x -4x + 8 = -1
Simplify.
3x + 8 = -1
Isolate 3x.
3x = -1-8
= -9
Find x.
x = -9 ÷ 3
= -3