Ask question

Ask question

All categories

Harlamova29_29 [7]

3 years ago

10

A chemist needs a 70% solution of tannic acid. How much distilled water must he add to 5 gallons of a 90% solution of acid to ob

tain the 70% solution?

1 answer:

kolezko [41]3 years ago

6 0

<span>4.5 + 0 = 3.5 + 0.7x
1 = 0.7x
x = 1/0.7
x = 1.43 gallons of distilled water
Hope this helps!!</span>

You might be interested in

MATCH THE number WITH ITS OPPOSITE

ycow [4]

To match the number with the opposite, we are flipping the sign. If the sign is originally a negative, it would become a positive, and vice versa.

Term: 3.2 Match (Opposite): B) - 3.2

Term: -2.3 Match (Opposite): D) 2.3

Term: -1.5 Match (Opposite): C) 1.5

Term: 5.1 Match (Opposite): A) -5.1

~

6 0

3 years ago

100 POINTS! IF YOU ANSWER THESE 5 QUESTIONS CORRECTLY :)

Sergeeva-Olga [200]

1. Use a computer to randomly select 30 student IDs from all her students2. If the ice cream store owner asks 2300 people, will most likely pick cheesecake to be the flavor of the month.3. I would need the line plot4. I would need the graph to solve5. I would need the graph to solveClick to let others know, how helpful is it

Read more on Brainly.com - brainly.com/question/3239357#readmore

5 0

3 years ago

Read 2 more answers

Approximately 85% of persons age 70 to 84 live in their own household and are income-qualified for home purchases.

miv72 [106K]

Answer:

The probability that exactly two of the four live in their own household and are income-qualified is = .0975

Step-by-step explanation:

Given -

Approximately 85% of persons age 70 to 84 live in their own household and are income-qualified for home purchases.

Probability of sucess ( p ) = 85% =.85

Probability of failure ( q ) = 1 - .85 =.15

n = 4

From combination of n events taking r sucess we use binomial distribution

$P(X = r) = \binom{n}{r}p^{r}q^{n-r}$

where , r = 2

the probability that exactly two of the four live in their own household and are income-qualified is =

$P(X = 2) = \binom{4}{2}0.85^{2}0.15^{4 - 2}$

= $\frac{4!}{(2!)(2!)} \times 0.7225 \times .0225$

= $6 \times 0.7225 \times .0225$

= .0975

4 0

3 years ago

What equation represents this sentence? 5 less than a number is 12. n−5=12 5=12−n 5=n−12 5−n=12

Lana71 [14]

Answer:

n-5=12

This is the answer

8 0

2 years ago

Is 2 a solution of the inequality 4 + a ≤ 6? *

zaharov [31]

Answer:

The answer is "Yes, 6 = 6"

Step-by-step explanation:

If you substitute 2 for A, you would get 4 + 2 is less than or equal to 6, which is true because 6 = 6.

7 0

3 years ago