step 1 LCD of 5 and 3 is 15
step2 convert the fractions to 15th's
-3/5 * 3/3 = -9/15
2/3 * 5/5 = 10/15
step3 -9/15 + 10/15 = (-9 + 10)/15
= 1/ 15 (answer)
Can you help me please I need help with a couple of questions
Answer:
Yes math is hard.
Step-by-step explanation:
Math includes a bunch of equations and mumbo-jumbo.
Answer:
b = 5√6
c = 10√5
Step-by-step explanation:
This is a 30-60-90 triangle
the hypotenuse is always twice the short leg
c = 2(5√2)
c = 10√5
The long leg is alway √3 times the short leg
b = √3(5√2)
b = 5√6
Notice that 45 hours is 3 times the half-life of 15 hours.
After the first 15 hours, 450 g decays to half this amount, 225 g.
After the next 15 (total 30), 225 g decays to 112.5 g.
After the next 15 (total 45), 112.5 g decays to 56.25 g.
