Evaluate:
7.78-4.2
Here, one decimal is not like decimal. So, first making it like decimal.
4.2 will be 4.20.
Now subtracting them.
7.78-4.203.58
Hence, the correct answer is 3.58.
Simplify 6.24+4.2
Evaluate the expression. Write fractions in the simplest form.
-4.2+8.1×(-1.9)
Evaluate the expression. Write your answer in scientific notation.(4.2×108)+(5.9×109)