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1 year ago

Lou started his savings account with 50$ he now only has 31$. What percent of change did his savings account have?

Mathematics

1 answer:

vladimir1956 [14]1 year ago

4 0

Answer:

Step-by-step explanation:

50 - 31 = 19

38%

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The circumference of a circle is 36 pi feet. What is the length of the radius of this circle?

diamong [38]

Answer: 18 feet

Step-by-step explanation:

Given: The circumference of circle is given by :-

$\text{Circumference}=2\pi r$ , where r is the radius of the circle.

Since, The circumference of a circle $=36\pi$ feet.

$2\pi r=36\pi\\\\\Rightarrow\ r=\frac{36\pi}{2\pi}i\\\\\Rightarrow\ r=18\text{ feet}$

Hence, the radius of the circle = 18 feet.

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2 years ago

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scale drawing Gabriel planned a vegetable garden. Use the scale and the scale drawing to complete the following statements. The

LuckyWell [14K]

Length: 21 meters

Width: 5.25 meters

<u>Scale changes to 1 cm : 9 cm</u>

- Length: 63 meters

- Width: 15.75 meters

New length is 3 times old length

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2 years ago

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Write a expression that shows 3 times the sixth power of 10

user100 [1]

(10 raised to the power of 6)×3

(10*6) ×3

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1 year ago

What is the zero in the quadratic function f(x)= 9x^2-54x-19?

Alex17521 [72]

Answer:

6.33... and 0.333...

Step-by-step explanation:

The quadratic formula is

$x=\frac{-b+\sqrt{b^2-4ac} }{2a}$ .

It is important because while some quadratics are factorable and can be solved not all are. The formula will solve all quadratic equations and can also give both real and imaginary solutions. Using the formula will require less work than finding the factors if factorable. We will substitute a=9, b=-54 and c=-19.

$x=\frac{-b+/-\sqrt{b^2-4ac} }{2a}\\x=\frac{-(-54)+/-\sqrt{(-54)^2-4(9)(-19)} }{2(9)}\\x=\frac{54+/-\sqrt{2916+684} }{18}$

We will now solve for the plus and the minus.

The plus,,,

$x=\frac{54+\sqrt{3600}}{18}\\x=\frac{54+60}{18}\\x=\frac{114}{18}\\x=6.3$

and the minus...

$x=\frac{54-\sqrt{3600}}{18}\\x=\frac{54-60}{18}\\x=\frac{-6}{18}\\x=-0.333...$

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2 years ago

2. In the product of (4a3 + 5a2 – 11a) and (-15 + 3a – 7a2), the co-efficient of a4 is …………………… .

vekshin1

Answer:

- 23

Step-by-step explanation:

We could do this the long way and expand the whole product or note that the $a^{4}$ terms arise from the product of the a³ and a terms and the product of the a² and a² terms, that is

4a³ × 3a = 12 $a^{4}$

+ 5a² × - 7a² = - 35 $a^{4}$

Summing gives

12 $a^{4}$ - 35 $a^{4}$ = - 23 $a^{4}$

with coefficient - 23

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2 years ago

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