Does anyone know how to do this HELP

Mathematics

2 answers:

fomenos3 years ago

7 0

-1.5(4-n)+2.8-1.5(4-n)+2.8

-3/2x(4-n)+2.8-1.5(4-n)+2.8
-3/2x(4-n)+14/5-1.5(4-n)+2.8
-3/2x(4-n)+14/5-3/2x(4-n)+2.8
-3/2x(4-n)+14/5-3/2x(4-n)+2.8

-1/10x(15(4-n)-28+15(4-n)-28)

-1/10x(60-15n-28+15(4-n)-28)
-1/10x(60-15n-28+60-15n-28)

-1/10x(64-15n-15n)
-1/10x(64-30n)

-1/10x2(32-15n)

-1/5x(32-15n

Andrew [12]3 years ago

4 0

Answer:

$3n-6.4$

Step-by-step explanation:

$-1.5(4-n)+2.8-1.5(4-n)+2.8$

Collect like terms:

$(-1.5(4-n)-1.5(4-n))+(2.8+2.8)$

Simplify:

$-3(4-n)+5.6$

Expand:

$-12+3n+5.6$

Collect like terms:

$3n+(-12+5.6)$

Simplify:

$3n-6.4$

You might be interested in

The area of a compact disc is 452 4/7 square centimeters. What is the diameter of a compact disc ? Use 22/7 as an approximation

motikmotik

$\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\ \cline{1-1} A=452\frac{4}{7} \end{cases}\implies 452\frac{4}{7}=\pi r^2\implies \cfrac{3168}{7}=\pi r^2 \implies \cfrac{3168}{7\pi }=r^2 \\\\\\ \stackrel{\pi =\frac{22}{7}}{\cfrac{3168}{7\cdot \frac{22}{7}}}=r^2\implies \cfrac{3168}{22}=r^2\implies 144=r^2\implies \sqrt{144}=r\implies 12=r \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill \stackrel{diameter=2r}{d=24}~\hfill$