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3 years ago

Help help help plz plz

Mathematics

1 answer:

DiKsa [7]3 years ago

4 0

Answer:2nd i think i hope this helps ! :)

Step-by-step explanation:

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Use the quadratic formula to solve the equation: 8x(x - 2) - 20 = 5x(x - 4)

FromTheMoon [43]

Answer: $x = 2, -\frac{10}{3}$

Write the equation in standard form: $ax^{2} + bx + c = 0$ .

$8x(x - 2) - 20 = 5x(x - 4)\\\\8x^{2} - 16x - 20 = 5x^{2} - 20x\\\\3x^{2} - 16x - 20 = -20x\\\\3x^{2} + 4x -20 = 0$

Use the quadratic formula. (+-) = ±

$\frac{-b (+-) \sqrt{b^{2} - 4ac } }{2a}$

Substitute in the values, where a = 3, b = 4, and c = -20, and simplify.

$\frac{-4(+-)\sqrt{(4)^{2} - 4(3)(-20)} }{2(3)} \\\\\frac{-4(+-)\sqrt{16 + 240} }{6}} \\\\\frac{-4(+-)\sqrt{256} }{6} \\\\\frac{-4(+-)16}{6} \\\\\frac{-4 + 16}{6}, \frac{-4 - 16}{6} \\\\\frac{12}{6}, \frac{-20}{6} \\\\2, -\frac{10}{3}$

$x = 2, -\frac{10}{3}$

3 0

4 years ago

A square picture with side length 30 cm is scaled by 60% on a photocopier the copy is then scaled by 60% again. What is the side

Sonja [21]

Answer:

10.8 cm

Step-by-step explanation:

we know that

1) A square picture with side length 30 cm is scaled by 60% on a photocopier

Remember that

$60\%=60/100=0.60$

The length of the first copy of the picture is

$30(0.60)=18\ cm$

2) The copy is then scaled by 60% again

The length of the second copy of the picture is

$18(0.60)=10.8\ cm$

4 0

3 years ago

Review the graph.

d1i1m1o1n [39]

Answer:

its D

Step-by-step explanation:

Edge 2021

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3 years ago

With one toss of a single number cube, what is the probability of rolling a number less than three

guajiro [1.7K]

Assuming the number cube has six sides, there are only two numbers less than three so 2/6ths or (simplied) 1/3.

5 0

3 years ago

Read 2 more answers

A random telephone survey of 1,091 adults (aged 18 and older) was conducted by an online tax preparation and e-filing service. T

vovikov84 [41]

Answer:

a. The percentage of all taxpayers who file electronically is 58%

b. 654 people used an accountant or professional tax preparer preparing the tax return

Step-by-step explanation:

According to the given data, in order to estimate the percentage of all taxpayers who file electronically, we would have to make the following calculation:

percentage of all taxpayers who file electronically=634×100%=0.58

1,091

Hence, the percentage of all taxpayers who file electronically is 58%

In order to calculate how many people used an accountant or professional tax preparer for preparing the tax return, we would have to make the following calculation:

people used an accountant or professional tax preparer= 60%×1,091=654

100%

654 people used an accountant or professional tax preparer preparing the tax return.

8 0

3 years ago