Answer:-21
Step-by-step explanation:
3•(-7)
3 x -7=-21
Answer:
The answer is 44.99
Step-by-step explanation:
divide 89.98/2= 44.99
Not always but your answer is sometimes
Answer:
D. 10^10
Step-by-step explanation:
Multiplying numbers with exponents rule : 
explanation of rule : we simply keep the bases the same and add the exponents.
10^3 • 10^7
keep the base as 10 and add the exponents

Keep in mind that this only works when the bases are the same.
If x equals 3 then y must equal 1.2