$\bf 21)\\\\
\cfrac{c}{a}=r+d\implies \cfrac{c}{r+d}=a
\\\\\\
23)\\\\
ka=v+w\implies a=\cfrac{v+w}{k}
\\\\\\
25)\\\\
z=y+mx\implies z-y=mx\implies \cfrac{z-y}{m}=x$

8 0

3 years ago

12c + 12 (3/4c) + 12 (1/2c) shows the total cost for buying 3 phones that each cost c dollars per month for 12 months.

alisha [4.7K]

Answer:

c(12 + 9 + 6)

12(2.25c)

Step-by-step explanation:

12c + 12 (3/4c) + 12 (1/2c)

12(1c) + 12(3/4c) + 12 (1/2c)

12(c + 3/4c + 1/2c)

12(2 1/4c)

12(2.25c)

12c + 12 (3/4c) + 12 (1/2c)

12c + 9c + 6c

c(12 + 9 + 6)

6 0

2 years ago

Write the number 4.2 x 10^2 in standard form.

Sav [38]

Answer:

420 (lol)

Step-by-step explanation:

6 0

3 years ago