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defon
3 years ago
7

An open box is made from a 10cm by 20cm Piece of Tin by cutting a square from each corner and folding the edges. The area of ​​t

he resulting base is 96 cm2. What is the length of the sides of the squares?
Mathematics
1 answer:
nydimaria [60]3 years ago
4 0

Answer:

2 cm

Step-by-step explanation:

If x is the length of the sides of the squares, then the height of the box is also x.  The length and width of the base are 10−2x and 20−2x.  The area of the base is the length times the width.

96 = (10 − 2x) (20 − 2x)

96 = 200 − 20x − 40x + 4x²

0 = 4x² − 60x + 104

0 = x² − 15x + 26

0 = (x − 2) (x − 13)

x = 2 or 13

Since x < 5, x = 2.

So the length of the sides of the squares is 2 cm.

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Carlos drove to the train station and back. The trip there took five hours and the trip back took four hours. What was Carlos' a
katrin2010 [14]

Answer: 54.4 mph

Step-by-step explanation:

First find the distance to the train station. If it took Carlos 4 hours to come back driving at 68 mph, the distance is:

= Speed * time

= 68 * 4

= 272 miles

This means that Carlos drove for 5 hours to cover 272 miles the first time. His average speed was therefore:

= Distance / time

= 272/5

= 54.4 mph

3 0
2 years ago
Eddie Hibbs earns a gross income of $42,300 a
Maslowich

Using proportions, it is found that his tax rate is of 28.84%.

<h3>What is a proportion?</h3>

A proportion is a fraction of a total amount, and the measures are related using a rule of three. Due to this, relations between variables, either direct(when both increase or both decrease) or inverse proportional(when one increases and the other decreases, or vice versa), can be built to find the desired measures in the problem, or equations to find these measures.

His tax rate is the proportion that the <u>deductions are of the total salary</u>, hence:

12,200/42,300 = 0.2884 = 28.84%.

Hence his tax rate is of 28.84%.

More can be learned about proportions at brainly.com/question/24372153

#SPJ1

5 0
2 years ago
is a stockbroker. Earns ​% commission each week. Last​ week, sold ​$ worth of stocks. How much did make last week in​ commission
GenaCL600 [577]

Answer:

a. $583

b. $30,316

Step-by-step explanation:

a. Commission last week;

= 5,300 * 11%

= $583

b. Commission in 2011 assuming weekly earnings of $583.

= 583 * 52 weeks

= $30,316

8 0
2 years ago
What is the inverse of f(x)=e^x
enot [183]

Answer:

f^{-1}(x)=\ln{x}

Step-by-step explanation:

An <em>inverse</em> function is any function that "undoes" another function. If we think of the function f as some kind of machine that takes in a number x as input and produces a number f(x) as an output, when we give inverse function f^{-1} the number f(x) as in input, we get x, our original input, as the output f^{-1}(x)

We need a function that undoes f(x)=e^x, and the natural choice for undoing an exponent is with a logarithm. Here, our base is e, so we'll choose \log_e{x}=\ln{x} as our inverse function. Let's see how that works:

f^{-1}(f(x))=\ln{e^x}

\ln{e^x} is the power we have to raise e to to get e^x, which is x, so

f^{-1}(f(x))=\ln{e^x}=x

And we have our function.

8 0
3 years ago
Does anyone know this answer?
vladimir1956 [14]
It is leaner because the progress of the tree growth is constant. Every year it increases 2 feet staring at 20 feet
3 0
3 years ago
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