A dozen plain hats cost 3.60,what is the unit rate of a hat?

Mathematics

2 answers:

deff fn [24]2 years ago

7 0

I think the answer should be 12.

madreJ [45]2 years ago

7 0

$3.60/12 = $0.30! You just take the total cost and divide by the total amount to find the cost of one hat

You might be interested in

Suppose a and b are both non zero real numbers. Find real numbers c and d such that 1/a+ib= c+id

Thepotemich [5.8K]

$\begin{gathered} c=\frac{a}{a^2+b^2} \\ d=\frac{-b}{a^2+b^2} \end{gathered}$

Explanation

$\frac{1}{a+bi}=c+di$

Step 1

multiplicate by the conjugate

$\begin{gathered} \frac{1}{a+bi}\cdot\frac{a-bi}{a+bi}=\frac{a-bi}{(a+bi)(a-bi)}=\frac{a-bi}{a^2-(bi)^2} \\ \frac{1}{a+bi}\cdot\frac{a-bi}{a+bi}=\frac{a-bi}{(a+bi)(a-bi)}=\frac{a-bi}{a^2-(-b^2)}=\frac{a-bi}{a^2+b^2} \end{gathered}$

notice that

$\begin{gathered} \frac{1}{a+bi}=\frac{a-bi}{a^2+b^2}=\frac{a}{a^2+b^2}-\frac{b}{a^2+b^2}i \\ \frac{a}{a^2+b^2}-\frac{b}{a^2+b^2}i=c+di \\ so \\ \end{gathered}$ $\begin{gathered} c=\frac{a}{a^2+b^2} \\ d=\frac{-b}{a^2+b^2} \end{gathered}$

I hope this helsp you

6 0

11 months ago

Which theorem or postulate proves the two triangles are similar

Alina [70]

Because all 3 sides are given for both triangles you can use the SSS theorem

5 0

2 years ago

Read 2 more answers

A length of ribbon measures 3 yd 1 ft 10 in.

Elza [17]

Answer : 11 3/5 inches each or 11.6 inches each