Hello!
To solve this, first assume all the coins are $1. Then, find the value that would have. 1 * 21 = $21.
Now, see how far away from $30 we are. 30 - 21 = 9. Therefore, we need an increase by $9.
For each coin changed from a $1 to a $2, how much of an increase is there? $1. Therefore, change 9 coins to $2 coins to have an increase of $9. If he has 9 $2 coins, he'll have 21 - 9 $1 coins, or 12.
Therefore, your final answer is 12 $1 coins and 9 $2 coins.
Hope this helps!
Answer:
-2.5
I got -2.5 as slope because slope is equal to rise over run so that means
the equation would turn out as -29+9/15-7=-20/8
-20/8=-2 4/8,-2 1/2,1/2=0.5,so the answer turns into -2.5
Answer:
1/216
Step-by-step explanation:
Answer:
Since length and width are perpendicular, Doubling either one will double the area. So Doubling both will quadruple the area. 2x2 = 4.
This idea works if the dimensions doubled are those that are used to compute area. Like the base and height of a triangle.
More generally, in a polygon, if all the sides are doubled, the area is multiplied by 4. In a circle, Doubling the radius will quadruple the area.
In 3 dimensions, Doubling one dimension will double the VOLUME. Doubling two perpendicular dimensions will quadruple the volume and Doubling 3 perpendicular dimensions will multiply the volume by 2x2x2 or 8.
Step-by-step explanation:
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