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2 years ago

12

Audrey and her little brother have been saving money to buy a new gaming system. So far, Audrey has saved $72. Her little brothe

r has saved $9. How many times as much money as her little brother has Audrey saved?

2 answers:

natta225 [31]2 years ago

4 0

8 times as much

How many times as much means 9 times what will give us 72.

72 / 9 = 8

Little bro’s $9 x 8 = Audrey’s $72

Alexandra [31]2 years ago

3 0

Answer:

The answer is 648

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3 years ago

Two children own two-way radios that have a maximum range of 3 miles. One leaves a certain point at 1:00 P.M., walking due north

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Answer:

The answer is 21 minutes

Step-by-step explanation:

We use the equation Xf = Xo + vt

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2) He walks for 15 minutes before kid 2 starts walking. In 15 minutes he is able to cover 1.5 [mi]

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3) Now, child 2 starts walking and we know that when the range reaches 3 miles, they won´t be able to communicate. So the sum of the final position of child 1 and child 2 must be 3[mi]

Child 1 final position => $x_{1f} = x_{1f1} +v_{1} t\\x_{1f} =1.5+v_{1} t$
Child 2 final position => $x_{2f} =0+v_{2} t$

4) Sum the equations and equate to 3

$x_{1f} +x_{2f} =3$

5) Substitute the values we already know

$1.5+v_{1} t+v_{2}t=3\\ 1.5+.1t+.15t=3\\1.5+.25t=3\\t=\frac{3-1.5}{.25} \\t=6 [min]$

6) in 15 + 6 minutes they will be 3miles apart

7) In 21 minutes they will still be able to communicate with one another.

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2 years ago

Somebody help with both questions

Minchanka [31]

1. X=5
2. I think I’m not sure is - 5.04

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2 years ago