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4 years ago

11

Rob is saving to buy a new MP3 player. For every $13 he earns babysitting, he saves $8. On Saturday, Rob earned $65 babysitting.

How much money did he save?

1 answer:

Vedmedyk [2.9K]4 years ago

6 0

Answer:

60

Step-by-step explanation:

So you first start off with 13 and 8 you subtract it and get five so he uses 5 every time he gets paid and you subtract 5 from 65 and get 60

--Hope this helps

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What is the answer to 0.10*200

stealth61 [152]

20 helped you well.

4 0

3 years ago

The length of a board is 2 5/8 feet long. If 5/6 of a foot is trimmed off, find the new length

nalin [4]

Answer:

New length is 3 3/20 ft.

Step-by-step explanation:

The total board is 2 5/8 feet long. And since 5/6 of a foot is trimmed off, that means each piece of wood is 5/6 feet.

We can now set up an equation like this ---> 5/6 ⋅ x = 2 5/8

Now we're going to simplify ---> 5/6 ⋅ x = 2 5/8

5/6 ⋅ x = 21/8

(multiply both sides by 6)

5x = 63/4

(divide both sides by 5)

x = 63/20

x= 3.15

So, the new length is 3.15 feet long, or 3 3/20 in mixed fraction.

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3 years ago

A bridge in the shape of an arch connects two cities separated by a river. The two ends of the bridge are located at (–7, –13) a

sdas [7]

Answer:

$y=-\dfrac{13}{49}x^2$

Step-by-step explanation:

The shape of an arch corresponds to a parabola.

the general equation for a parabola is:

$y=ax^2+bx+c$

we're given three coordinates: (-7,-13),(7,-13) and (0,0)

so we can plug these values in the general equation to make 3 separate equations:

(x,y) = (-7,-13)

$-13=a(-7)^2+b(-7)+c$

$49a-7b+c=-13$

(x,y) = (7,-13)

$-13=a(7)^2+b(7)+c$

$49a+7b+c=-13$

(x,y) = (0,0)

$0=a(0)^2+b(7)+c$

$c=0$

so we have three equations. and we can solve them simultaneously to find the values of a,b, and c.

we've already found c = 0, let's use substitute it to other equations.

$49a-7b+c=-13\quad\Rightarrow\quad49a-7b=-13$

$49a+7b+c=-13\quad\Rightarrow\quad49a+7b=-13$

we can solve these two equation using the elimination method, by simply adding the two equations

$\quad\quad49a-7b=-13\\+\quad49a+7b=-13$

------------------------------

$\quad\quad 98a=-26$

$\quad\quad a=-\dfrac{13}{49}$

Now we can plug this value of a in any of the two equations.

$49a-7b=-13$

$49\left(-\dfrac{13}{49}\right)-7b=-13$

$-13-7b=-13$

$-7b=0$

$b=0$

We have the values of a,b, and c. We can plug them in the general equation to find the equation of the arch.

$y=\left(-\dfrac{13}{49}\right)x^2+0x+0$

$y=-\dfrac{13}{49}x^2$

$49y=-13x^2$

This our equation of the arch!

5 0

3 years ago

Divide 1/7 divided by 6

ArbitrLikvidat [17]

Answer:

1/42

Step-by-step explanation:

1/7 ÷ 6/1

1 x 1 = 1

------------

7 x 6 = 42

1/42

already simplified to the fullest

hope that helps!

6 0

3 years ago

Four 5th graders are taking turns visiting a 2nd grade classroom to read aloud from a chapter book . The book has 38 pages. If t

just olya [345]

Answer:

9.5

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers