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2 years ago

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A molecule of sodium carbonate contains 2 atoms of sodium to every 3 atoms of oxygen. Could a compound containing 12 atoms of so

dium and 15 atoms of oxygen be sodium carbonate ? Explain

1 answer:

lys-0071 [83]2 years ago

7 0

Ask this question in the science category xoxo

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phyllis invested 66000 dollars, a portion earning simple interest rate of 5% per year and the rest earning a rate of 7% per year

Lelechka [254]

<u>Answer: </u>

Physliis invested 32000 dollar at 5% interest rate and 34000 dollar at 7% interest rate.

<u>Solution:</u>

Let Phyllis invest ‘x’ dollar at 5% per year and (66000-x) dollar at 7% per year.

We know,

$\text { Simple interest }=\frac{\text {Principal} \times r a t e \times T i m e}{100}$

In the question it is given that Simple interest earned from both the investments at the end of the year is $3980.

Using the given below equation, we will try to find out the investments at each rate.

$\begin{array}{l}{\frac{x \times 5 \times 1}{100}+\frac{(66000-x) \times 7 \times 1}{100}=3980} \\\\ {\frac{5 x}{100}+\frac{462000-7 x}{100}=3980} \\\\ {\frac{5 x+462000-7 x}{100}=3980} \\\\ {-2 \mathrm{x}+462000=3980 \times 100} \\\\ {-2 \mathrm{x}=398000-462000} \\\\ {-2 \mathrm{x}=-64000} \\\\ {\mathrm{x}=\frac{-64000}{-2}}\end{array}$

x = 32000

We can calculate amount for 7% interest rate by,

(66000-32000) =34000

Thus Phyllis invested 32000 dollar at 5% interest rate and 34000 dollar at 7% interest rate.

8 0

2 years ago

Subtract. <br> (2p^2+q)-(p^2+q)<br> Is the answer<br> P^2<br> P^2+2q<br> P^2-2q<br> 3p^2

Fofino [41]

Answer:

-p5q2 - p3q5 + 2p3 + 2pq2 + 2q3

____________________________

p3q2

Step-by-step explanation:

2

Simplify ——

q2

Equation at the end of step 1 :

(p+q) 2

(((2•—————)-(q3))+——)-p2

(p3) q2

Step 2 :

p + q

Simplify —————

p3 (p + q) 2

(((2 • ———————) - q3) + ——) - p2

p3 q2

Step 3 : 2 • (p + q) 2

((——————————— - q3) + ——) - p2

p3 q2 q3 q3 • p3

q3 = —— = ———————

1 p3

4 0

2 years ago

<img src="https://tex.z-dn.net/?f=%5Csf%5Cfbox%5Cred%7B%E1%9F%94question%E1%9F%94%3A-%7D%20" id="TexFormula1" title="\sf\fbox\re

Assoli18 [71]

Answer:

A. 560

Step-by-step explanation:

multiply 600 by 0.93 in order to find out what 93% of 600 is.

600 x 0.93 = 558

since 558 isn't one of the options you find which one is closest to it, then divide by 600 in order to see if it's still 93%

a) 560/ 600 = 0.93333 = 93.3%

there's your answer.

but to compare it with the rest of the answer choices:

b) 540 / 600 = 0.9 = 90%

c) 470 / 600 = 0.78333 = 78.3%

d) 490 / 600 = 0.81667 = 81.6%

none of these are in the range of 93, so they're incorrect

6 0

1 year ago

I need help with this question. It's about inequalities.

PtichkaEL [24]

N is greater than it equal to 3

So you put a shaded in for a three and draw a line to the right

I think :)

5 0

3 years ago

5x−2(x+1)=1/4 find x pretty please

disa [49]

Answer:

$\huge\boxed{\bf\:x = \frac{3}{4}}$

Step-by-step explanation:

$5x - 2(x+1)=\frac{1}{4}$

Use the distributive property for 2(x + 1).

$5x - 2x - 2= \frac{1}{4}$

Subtract 2x from 5x.

$3x - 2= \frac{1}{4}$

Bring 2 to the right hand side of the equation .

$3x = \frac{1}{4} + 2$

Add 1/4 & 2.

$3x = \frac{1}{4} + \frac{8}{4} \: \: [LCM = 4]\\3x = \frac{9}{4}$

Now, bring 3 to the right hand side of the equation .

$x = \frac{9}{4} \times \frac{1}{3}\\x = \frac{9}{12}\\\boxed{\bf\:x = \frac{3}{4}}$

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6 0

1 year ago

Read 2 more answers