The sentence "15% of 4x is 20 less than x"
translates to 0.15 • (4x) = x – 20
Solving that…
0.15(4x) = x - 20 multiplipy 0.15•4
0.6x = x - 20 subtract x from both sides
-0.4x = - 20 divide both sides by -0.4
x = 50
Answer:
Step-by-step explanation:
(5 dollars)/(4 girls) = (5/4 dollars)/girl = (1.25 dollars)/girl
:::::
(5.52 dollars)/(4 girls) = (5.52/4 dollars)/girl = (1.38 dollars)/girl
3<em>z</em> = (2<em>w</em> - 5)³
When <em>z</em> = 9, we have
27 = (2<em>w</em> - 5)³ → 3 = 2<em>w</em> - 5 → <em>w</em> = 4
Differentiate both sides with respect to <em>t</em> :
3 d<em>z</em>/d<em>t</em> = 3 (2<em>w</em> - 5)² d<em>w</em>/d<em>t</em>
d<em>z</em>/d<em>t</em> = (2<em>w</em> - 5)² d<em>w</em>/d<em>t</em>
Plug in everything you know and solve for d<em>z</em>/d<em>t</em> :
d<em>z</em>/d<em>t</em> = 3² • (1/3)
d<em>z</em>/d<em>t</em> = 3
3.7, 3 3/4, 31/8, 3.89
Hope this helps.
