3. Compute the product axb in each of the following cases:
a) a = -7.5
and b=0.25 ;
b) a = -2.5
and b=-18;
c) a = -812
and b=-0.75;
d) a = 4.25 and b= -326.​

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

2.5 milligrams is equivalent to how many grams