ElectricPavlov

The amount of drug left each day is 95 %     .95 in decimal form

130 mg  = 200 mg (.95)^t      Where t = days

130/200  = .95^t

t = 8.40 days

Short side = s

Longest side    = s+6

third side =  2 *s = 2s

added together they equal 25

s   +  s+6   +   2s  = 25

4s +6 = 25

4s = 19

s = 19/4

Longest  ==   43/4

third side = 19/2     

Your Question is truncated...where is the rest of it? 

\(\sum_{1}^{11}\) -9 + 8(n-1)      is one way

= 341

p = price

p x 40% = 14.40     

p x .4  = 14.40

p = 14.40/.4 = $ 36.00

x² + 5/3 x   +   ?          Use 'completing the square ' method

take 1/2   of    5/3     = 5/6  and square it    25/36

x^2 + 5/3 x + 25/36   = (x + 5/6)²  

f(x) = L e^kx       when x = 0     f(x) = 7   

7 = L e^k(0)

L = 7

f(x) = 7 e^kx         when x = 4     f(x) = 112

112 = 7 e^k(4)

ln (112/7)  = k4

k = .69315

f(x) = 7 e^{.69315 x}

https://web2.0calc.com/questions/plx-help-thx#r1

Price increase 1%/year     .01 in decimal form

6  =  3.34 (1+.01)^t      where t is in years (the answer to the Q)

6/3.34 = 1.01^t

  ^{t = 58.87 years}

Use law of cosines

  c2 = a2 + b2 − 2ab cos(C)

C = Arccos ((a² + b² - c²) / 2ab)

smallest angle (C) will be across from side 11  

C = arcos( (19^2+ 13^2 - 11^2)/2(13)(19) 0  = 34.11 = ~~34 degreesdegrees