Trapizoid area formula = (b1+b2)/2×h
rectangle formula =l×w
trapizoid 1: (12+16)/2×5
trapizoid 2: (12+16)/2×5
rectangle: 10×12
solve
t1 + t2:
(12+16)/2×5
28/2×5
14×5=70 +70=
140 ft^2

r: 10×12=120ft^2

140-120=20ft^2 of wood

8 0

3 years ago

Polonium-210 is a radioactive substance with a half life of 138 days. If a nuclear facility is handling 265 grams of polonium-21

dlinn [17]

The half life is 138 days, meaning exactly half of the material will decay after this time. Use this information to find the decay factor $k$ :

$\dfrac12=e^{138k}\implies k=-\dfrac{\ln2}{138}$

Then after 250 days, there will be

$265e^{250k}\approx75.492$

grams left.

5 0

4 years ago

Read 2 more answers

Find the length of the hypotenuse of a right triangle whose legs are 3 and . 2

lapo4ka [179]

Answer:

The answer would be 3.606, but rounded is 3.61, or 3.6

Step-by-step explanation: A^2+B^2 = c^2, so 3x3=9

2x2=4,

9+4=13

Then square 13, which would give you 3.606

8 0

3 years ago

(-4)(5)(-1)(-2) what i the answer to this equation

katrin2010 [14]

So, this is -4 * 5 * -1 * -2
this is -20 * 2
total is -40

Hope this helps :)

5 0

3 years ago