Simplify this expression:
16 + 28 ÷ 2 – 6
10 – 4 x 2

Can some one explain this i got sent this. is this a threat i’m scared

The half-life of a certain material is 0.004 second. approximately how much of a 20-gram sample will be left after 0.016 second? a. 5 grams b. 16 grams c. 0.32 gram d. 1.25 grams

What is 4 square root 7^3 in exponential form?