Derek bought 6.00 worth of 21 cent stamps and 41 cent stamps.

Mathematics

1 answer:

sattari [20]1 year ago

6 0

we have the expression

$0.21s+0.41(s-2)=6.00$

Solve for s

that means ----> isolate the variable s

$0.21s+0.41s-0.82=6.00$

Combine like terms

$\begin{gathered} 0.62s=6.00+0.82 \\ 0.62s=6.82 \end{gathered}$

Divide by 0.62 both sides

$\begin{gathered} s=\frac{6.82}{0.62} \\ s=11 \end{gathered}$

You might be interested in

I traveled 117 miles in 2.25 hours. What was my average speed? How would I solve this ?

LenKa [72]

117 miles in 2.25 hours

Divide both numbers by 2.25

52 miles per hour

3 0

3 years ago

Read 2 more answers

During second period, Bonnie completed a grammar worksheet. She got 18 out of 20 questions correct. What percentage did Bonnie g

sp2606 [1]

Answer:

90% correct

Step-by-step explanation:

You want to make calculating easy and to do this, you multiply write out 18 out of 20 like a fraction, 18/20, and multiply both the numerator and the denominator by 5 because 20*5 = 100. 18*5 = 90. 90/100 is the same thing as 90%. Hope this helps!

8 0

3 years ago

(Write the equation for the line that goes through<br> -3,-3) slope 7/3

grin007 [14]

$\bf (\stackrel{x_1}{-3}~,~\stackrel{y_1}{-3})~\hspace{10em} \stackrel{slope}{m}\implies \cfrac{7}{3} \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{(-3)}=\stackrel{m}{\cfrac{7}{3}}[x-\stackrel{x_1}{(-3)}] \implies y+3=\cfrac{7}{3}(x+3) \\\\\\ y+3=\cfrac{7}{3}x+7\implies y=\cfrac{7}{3}x+4$