Answer:
minus 15 by 4
Step-by-step explanation:
minus 9 by 4 minus 3 by 2 lcm then add
Answer:
4t+9
Step-by-step explanation:
In twelve years Mary will be 45 and her son will be 23.
Step-by-step explanation:
For writing the expression, represent 'a number' as x, as it's unknown.
<u>The word format explains;</u>
Four less than x.
Subtracting 4 from x will represent four less than x.
<u>Expression is represented as;</u>

Answer:
Standard Notation -> Scientific Notation
11) 2.2 × 10^1
13) 6.9 × 10^1
15) 6 × 10^-1
17) 1.8 × 10^0
19) 6.14 × 10^1
Scientific Notation -> Standard Notation
1) 0.0894
3) 44.6
5) 3.2
7) 120
9) 4.23