Answer:
180% ; 5
Step-by-step explanation:
Purchase price per coat = 55
Sales price per coat = 99
% of purchase price is sales price :
X% * 55 = 99
(x / 100) * 55 = 99
0.01x * 55 = 99
0.55x = 99
x = 99 / 0.55
x = 180
180% of purchase price
B.)
180% * 45 = 81 per jacket
Number of jackets to sell to make atleast $390 in sales
$390 / $81 = 4.8
Hence, 5 jackets
The correct answer to the first task, is:
7(x-3) = 4(x + 5) ( im assuming x + 5 by the ordering of the numbers, and ive seen many people doing the same mistake.)
7x-21 = 4x + 20
7x-4x = 21+20
3x = 41
The answer is 41/3.
I found this quite ugly, so i will do it by multiplication as it is acctualy written, also.
7x - 21 = 20x
7x-20x = 21
-13x = 21
x = -21/13 which is just as ugly.
If i input a - however:
7x-21 = 4x-20
3x = 1
x = 1/3
Thats all the possible answers, (except by division).
The correct answer to the second task, is 14 - x. Because she was x years younger than 14.
When a number is next to a letter like so: 3m You would multiply, so
3 ~ 2 = 6 then solve the problem like this
11-3m= ?
3~2=6
6-11=5
so 11-3m=5
Hope this helps! :)
Answer:
Step-by-step explanation:
We are given that
Radius of sphere expanding at the rate=
Volume of sphere=
Surface area of sphere=
We have to determine the rate at which the volume is changing with respect to time at r= 2 cm.
Differentiate w.r.t time
Substitute the values then we get
Hence, the rate at which the volume of sphere is changing is given by