100 = 2t + 4f
40= t + f
-----------
get t or f by itself first.
f = 40 - t : Then substitute it back into for f in the other equation
100 = 2t + 4f
100= 2t +4(40-t)
100= 2t + 160 - 4t
100 = -2t + 160
-160 -160
<u>-60 </u>= <u>-2t
</u>-2 -2
t = 30 (Then plug this into either equation to solve for f)
Therefore,
t = 30 questions
f = 10 questions
20 weeks, earnings $(15 + 35), spending $300:
<span>20(15 + 35) - 300 = amount of money she has left
</span>
Answer: 100
Step-by-step explanation:
The formula for the area of a trapezoid is (B1+B2)/2*h
so substitute:
(8+12)/2*10
20/2*10
10*10
100
Answer:
f(7) = 1.08
Step-by-step explanation:
Given that:
f(5) = 12
A geometric sequence that is defined recursively by the formula
.....[1 ] where, n is an integer and n> 0.
Substitute n = 6 in [1] we have;

Using f(5) = 12 we have;

⇒
We have to find f(7).
Substitute n = 7 in [1] we have;

Substitute the given values f(6) = 3.6 we have;

Simplify:
f(7) = 1.08
Therefore, the value of f(7)to the nearest hundredth is, 1.08
Answer:
Answer is C
Step-by-step explanation:
just did the test