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SashulF [63]
3 years ago
14

Suppose Johnny invests $2,745 into an account, which has been earning interest for many years and he now has a total of $39,974.

In two or more sentences explain why a negative number would/wouldn’t be reasonable in the solution of the rate he received on his investment.
Mathematics
1 answer:
Mila [183]3 years ago
5 0
He earn around $36629 as intrest.
so usually intrested is calculated according to the percentage.
some monthly and annually.

so you cannot have negative number for %
and he gained then there no way .then have negative number..
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A problem states: "There are 2 more horses than cows in a field. There are 15 animals in the field in all. How many horses are t
mash [69]
Let h =  the number of horses in the field
Let c =  number of cows in the field

There are 2 more horses than cows in the field. Therefore
h = c + 2
 or
 c = h - 2               (1)

There are 15  animals in the field. Therefore
h + c = 15              (2)

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Find the dimensions of the rectangle with area 256 square inches that has minimum perimeter, and then find the minimum perimeter
mezya [45]

Answer:

Dimensions: A=a\cdot b=256

Perimiter: P=2a+2b

Minimum perimeter: [16,16]

Step-by-step explanation:

This is a problem of optimization with constraints.

We can define the rectangle with two sides of size "a" and two sides of size "b".

The area of the rectangle can be defined then as:

A=a\cdot b=256

This is the constraint.

To simplify and as we have only one constraint and two variables, we can express a in function of b as:

b=\frac{256}{a}

The function we want to optimize is the diameter.

We can express the diameter as:

P=2a+2b=2a+2*\frac{256}{a}

To optimize we can derive the function and equal to zero.

dP/da=2+2\cdot (-1)\cdot\frac{256}{a^2}=0\\\\\frac{512}{a^2}=2\\\\a=\sqrt{512/2}= \sqrt {256} =16\\\\b=256/a=256/16=16

The minimum perimiter happens when both sides are of size 16 (a square).

4 0
3 years ago
I need help with this question it's for a important grade so pls really help.​
iogann1982 [59]

Answer:

Check pdf

Step-by-step explanation:

Download pdf
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Nishi practiced violin for 3 1/2 hours in a 5-day period. How many minutes
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Answer:

.7 min per day

Step-by-step explanation:

3.5 ÷5=0.7

0.7×5=3.5 or 3 1/2

6 0
3 years ago
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