**Answer:**

f=-15/4

**Step-by-step explanation:**

**Answer:**

**The radioactive substance will decay in 17.70 hours .**

**Step-by-step explanation:**

Given as :

The rate of decay of radioactive substance = 4 % per hour

Let The original weight of substance = w

The final weight of substance =

Let the hours for decay of substance = n

Now,

**The weight of substance after n years = The original weight of substance × **

or,

= w ×

Or, =

or, =

or, =

Taking log both sides :

Log = Log

So, Log = n × Log

∴ - 0.301 = n × ( - 0.017 )

So , n =

I.e n = 17.70 hours

**Hence The radioactive substance will decay in 17.70 hours . Answer**

**Answer:**

128 fl oz

**Step-by-step explanation:**

X-4y=-18

an easy way is to solve for oone variable

solve for x

add 4y both sides

x=4y-18

when y=1, x=-16

when y=0, x=-18

when y=2, x=-10

(x,y)

so some orderd pairs are

(-16,1)

(-18,0)

(-10,2)

**Answer:**

y+2 = -3(x-2)

**Step-by-step explanation:**

Point slope form of an equation is

y-y1 = m(x-x1) where m is the slope and (x1,y1) is a point on the line

y - -2 = -3( x-2)

y+2 = -3(x-2)