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Tema [17]
3 years ago
14

If Jan can buy 12 copies of a certain book for $40, what is the unit rate for cost per copy? How much

Mathematics
1 answer:
natita [175]3 years ago
7 0

Answer:

12 copies=$40

1 copy=$40÷12=$3.33

18 copies=$3.33×18=$60

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Select all point that lie on the circle
Vitek1552 [10]

Answer:

jjjokiioololll.hgyuhhkopohjo

6 0
3 years ago
About 7/10 of the human body is water. If a person weighs 130 pounds about how many pounds are water?
sveticcg [70]
Amount of water=(7/10) * Weiht of the person
Amount of water=0.7 * 130 pounds=91 pounds.

answer: 91 pounds of water.
4 0
4 years ago
Given the rectangle abcd shown below has a total area of 72. E is in the midpoint of bc and f is the midpoint of dc. What is the
scoray [572]

Refer to the attached image.

Given the rectangle ABCD of length 'l' and height 'h'.

Therefore, CD=AB = 'l' and BC = AD = 'h'

We have to determine the area of triangle AEF.

Area of triangle AEF = Area of rectangle ABCD - Area of triangle ADF - Area of triangle ECF - Area of triangle ABE

Area of triangle ADF = \frac{1}{2}bh

= \frac{1}{2}(DF \times AD)

= \frac{1}{2}(\frac{l}{2} \times h)

=\frac{lh}{4}

Area of triangle ECF = \frac{1}{2}bh

= \frac{1}{2}(CF \times CE)

= \frac{1}{2}(\frac{l}{2} \times \frac{h}{2})

=\frac{lh}{8}

Area of triangle ABE = \frac{1}{2}bh

= \frac{1}{2}(AB \times BE)

= \frac{1}{2}(l \times \frac{h}{2})

=\frac{lh}{4}

Now, area of triangle AEF =

Area of rectangle ABCD - Area of triangle ADF - Area of triangle ECF - Area of triangle ABE

= 72 - (\frac{lh}{4} + \frac{lh}{8} + \frac{lh}{4})

= 72 - (\frac{2lh+lh+2lh}{8})

=72 - (\frac{5lh}{8})

=72 - (\frac{5 \times 72}{8})

=\frac{72 \times 8 - (5 \times 72)}{8}

= 27 units

Therefore, the area of triangle AEF is 27 units.

8 0
3 years ago
Question is there below
emmainna [20.7K]

Answer:

-\frac{bc}{a^{2} }

Step-by-step explanation:

We are given f(x)=ax^{2} +bx+c, \alpha and \beta are zeros of the function. We can use the sum and product of roots. You may have come across these equations before ↓

\alpha +\beta =-\frac{b}{a}

\alpha \beta =\frac{c}{a}

Since the coefficients are already in a, b, and c's, we do not need to sub in anything else.

Now, you are asked to evaluate \alpha ^{2} \beta +\alpha \beta ^{2}. The next step after finding the roots above ↑, is to factorise this equation to be solved.

\alpha ^{2} \beta +\alpha \beta ^{2}

= \alpha \beta (\alpha +\beta )

Sub in each respective roots,

= \frac{c}{a} (-\frac{b}{a} )

= -\frac{bc}{a^{2} }

Hope this helped! Ask me if there's any part of the working you don't understand :)

5 0
4 years ago
Matteo is following this recipe to make a cake.
Vika [28.1K]

Answer:

Answer vary: to make 3 cakes this is what Matteo needs

9 ounces of butter

12 ounces of sugar

15 ounces of flour

6 eggs

3 teaspoons (tsp) baking powder

Step-by-step explanation:

honestly in my opinion thats my answer but it might be wrong. you could add or multiply it, I added the ingredients 3 times but it’s more simple to multiply each by 3.

3 times 3 = 9

4 times 3 = 12

5 times 3 = 15

2 times 3 = 6

1 times 3 = 3

4 0
3 years ago
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