I really need help ASAP

Answer and Step-by-step explanation:

For these, you have to make sure the same amount of moles are on each side of the chemical equation.

[tex]1ZN + 2HCL[/tex] → [tex]1ZnCL_{2} + H_{2}[/tex]

[tex]1SiO_{2} + 4HF[/tex] → [tex]SiF_{4} + 2H_{2} O[/tex]

[tex]12HCIO_{4} + 1P_{4} O_{20}[/tex] → [tex]4H_{3}PO_{4} + 6Cl_{2} O_{7}[/tex]

These are the balanced equations.

#teamtrees #WAP (Water And Plant)

Answer:

Ths sum of the first 38 terms is [tex]\frac{1,045}{2}=522.5[/tex]

Step-by-step explanation:

Arithmetic Sequences

They are identified because any term n is obtained by adding or subtracting a fixed number to the previous term. That number is called the common difference.

The equation to calculate the nth term of an arithmetic sequence is:

[tex]a_n=a_1+(n-1)r[/tex]

Where

an = nth term

a1 = first term

r   = common difference

n  = number of the term

The sum of n terms of the sequence is

[tex]S_n=\frac{n}{2}( a_1 + a_n)[/tex]

The common difference is found by subtracting two consecutive terms:

[tex]r=a_{n+1}-a_n[/tex]

Using the first two terms:

[tex]r=a_2-a_1=5-\frac{9}{2}=\frac{1}{2}[/tex]

Now we find the term n=38

[tex]\displaystyle a_{38}=\frac{9}{2}+(38-1)\frac{1}{2}[/tex]

[tex]\displaystyle a_{38}=\frac{9}{2}+\frac{37}{2}=\frac{46}{2}=23[/tex]

The sum is:

[tex]\displaystyle S_{38}=\frac{38}{2}( \frac{9}{2} + 23)[/tex]

[tex]\displaystyle S_{38}=19( \frac{9+46}{2})[/tex]

[tex]\displaystyle S_{38}=19( \frac{55}{2})= \frac{1,045}{2}=522.5[/tex]

Ths sum of the first 38 terms is [tex]\mathbf{\frac{1,045}{2}=522.5}[/tex]

C. because 103° and angle b are vertically opposite angle and angle b is corresponding to x

Answer:

he has 35 students all together

Step-by-step explanation:

15 divided by 3(the girls)=5. 5 x 4(the boys)=20. 20 + 15 =35.

Answer:

35

Step-by-step explanation:

Answer:

50 green

Step-by-step explanation:

19 blue

38 spaceman

Answer:

Step-by-step explanation:

Total number = 150

Answer:

subtract 2

Step-by-step explanation:

Answer:

Divide an odd number by 3

Step-by-step explanation:

Answer:

The percent decrease from 6 to 5.4 is 10%.

Step-by-step explanation:

Answer:

a c 77

Step-by-step explanation:

Answer:

Step-by-step explanation:

301.56

Answer:

3

Step-by-step explanation:

Answer:

16

Step-by-step explanation:

1222eat 222x21d3332

Step-by-step explanation:

[tex] \frac{(5 {n}^{5} ) ^{3} }{( {n}^{2} ) ^{7} } = 875[/tex]

[tex] \frac{5 {n}^{15} }{ {n}^{14} } = 875[/tex]

[tex]5 {n}^{15 - 14} = 875[/tex]

[tex]5n \: = 875[/tex]

[tex]n \: = \frac{875}{5} [/tex]

Therefore n = 175

Hope it will help :)❤

Answer:

On brainly we help each other what need help with

Step-by-step explanation:

Answer:

There shouldn't be any divison with this problem. If one gallon gets you thirty miles, then 13 gallons would get you 13 x 30 miles. There's no need for fractions. (He'd drive 390 miles on 13 gallons, by the way)

Step-by-step explanation:

Answer:

The median is 16.

Step-by-step explanation:

To find the median of a set, first we sort the set in an incresing way. So

3,5,8,11,15,16,18,22,23,32,36

The set has 11 elements, so the median will be element at the position (11+1)/2 = 6, that is, the 6th element of the sorted set.

In this case, the median is 16.

Answer:

1•2n

Step-by-step explanation:

Given the sequence if numbers

1 2 , 1 4 , 1 6 , 1 8 , 1 10 , ...

You will see that 1 is common to all the numbers, the other part of the sequence are in arithmetic progression and they are

2,4,6,8,10...

The nth term of an AP is expressed as

Tn = a+(n-1)d

a is the first term

n is the number of terms

d is the common difference

a = 2

d = 4-2 = 6-4 = 8-6 = 2

Substitute into the formula

Tn = 2+(n-1)2

Tn = 2+2n-2

Tn = 2-2+2n

Tn = 2n

Hence the nth term of the sequence is 1•2n

Answer:

Option A

Step-by-step explanation:

[tex] \sec( \alpha ) = \frac{hypotenuse \: of \: tringle}{side \: adjacent \: to \: \alpha } [/tex]

where [tex] \ alpha [/tex] is an angle of triangle.

In the triangle given above , [tex] \ alpha = angle A [/tex]. So,

[tex] \sec(A) = \frac{10}{8} = 1.25[/tex]

Answer:

a, shoudl eb ur answer

Step-by-step explanation:

Answer:

$1.60 tip on a $8 sandwich

Step-by-step explanation:

SO to find percent

just multiply the number by the percent

Remeber the percent means x/100

SO in this case 20/100 or 1/5

So you can just multiply 1/5*8 and get 1 3/5.

If you convert 3/5 into a decimal

3 divided by 5

that is .6

SO add them up

1+0.6= $1.60

Answer:

irrational

Step-by-step explanation:

Answer:

3(x - a)(x - b)(x - c) when a + b + c = 3x .

Step-by-step explanation:

i don't know but this has to be right

Answer:

3 hours was spent on labor

Step-by-step explanation:

Key skills needed: Creating an equation, Solving an equation

1) The total cost is 329.00 (or 329). The parts are 125.00 (or 125), and the labor is 68 per hour.

2) If we say h is the number of hours of labor, then we can create this equation --> [tex]68h[/tex] (or 68 multiplied by "h") 68h would be the cost of labor, and we need to find the number of hours (h) as a number.

3) We can create this equation --> [tex]329 = 125 + 68h[/tex]

--> This equation can be made as the total cost (329) is equal to the parts (125) and the labor (68h)

4) Subtract 125 from both sides to get 68h by itself

--> 329 - 125 = 204 so 204 = 68h

--> Divide by 68 on both sides (204 divided by 68 is 3)

--> This means that h is 3.

Therefore, the number of hours spent on labor is 3.

Hope you understood and have a nice day!! :D

Answer:

7% does not represent the part 0.7 of the push-ups Malik completes because 7% is NOT equivalent to 0.7.

Step-by-step explanation:

Given that Malik completes 0.7 of the total number of push-ups his coach requires.

Checking the given options:

7% = 7/100 = 0.07

14/20 = 0.7

70% = 70/100 = 7/10 = 0.7

0.70 = 0.7

Therefore,

7% does not represent the part 0.7 of the push-ups Malik completes because 7% is NOT equivalent to 0.7.

Step-by-step explanation:

So lets multiply the parantheses by -3 we get

-3×2x-3×6

Which we can write as

-6x-18

Answer:

[tex]\huge\boxed{\boxed{{\boxed{{-6x-18}}}}}[/tex]

Step-by-step explanation:

Hello.

In order to simplify the expression, we should multiply -3 times 2x and 6:

-3 times 2x = -6x

-3 times 6=-18

-6x-18

And we're done!

I hope it helps & have an outstanding day!

~ST2710 :)

Answer:

-5 1/2 < -3

Step-by-step explanation:

because the higher or bigger the number is as a negative the lower the number really is.

Hope this helps!

Answer:

Step-by-step explanation:

So, first lets the probability of just finding a yellow marble. There are 9+5+2+4 marbles in total, and that is 19 marbles.

5 out of those 20 are yellow, so the probabilty is 5/20 which is 1/4 or 20%

Then, lets do just finding the probability of a color that isn't blue.

Out of 20 marbles, 11 are color not blue, and 9 are.

So that probability is 11/20

Now, I think we need to do 11/20-5/20 so 6/20=3/10

Im so sorry, I might be wrong. I found both probabilities but I dont know if my final step is right.

9514 1404 393

Answer:

  2.  K'(-1, -5)

  3.  (-3, 5), (3, 10), (-6, 8); translation left 2 and up 7

Step-by-step explanation:

2. The transformation is the one you have shown:

  (x, y) ⇒ (x, -y) . . . . reflection over the x-axis

You are given the coordinates for K and asked for K', the reflected point. Use the x- and y-values in the transformation formula:

  K(-1, 5) ⇒ K'(-1, -5) . . . . . . the y-coordinate is negated

It's that simple.

__

3. Same deal, different formula.

  (x, y) ⇒ (x -2, y +7)

  A(-1, -2) ⇒ A'(-1-2, -2+7) = A'(-3, 5)

  B(5, 3) ⇒ B'(5 -2, 3 +7) = B'(3, 10)

  C(-4, 1) ⇒ C'(-4 -2, 1 +7) = C'(-6, 8)

When constants are added to the coordinates, the transformation is a translation.

The x-values are decreased by 2, so that is a shift left by 2 units.

The y-values are increased by 7, so that is a shift up by 7 units.

The attachment shows the translated triangle (red). The translation vector (-2, 7) is shown as a black arrow. You will notice each triangle vertex is translated that length in that direction.

Answer:

(B)  24

Step-by-step explanation:

Answer:

The margin of error for a 95% confidence interval is of 2.18 hours.

Step-by-step explanation:

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 100 - 1 = 99

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 99 degrees of freedom(y-axis) and a confidence level of [tex]1 - \frac{1 - 0.95}{2} = 0.975[/tex]. So we have T = 1.984

The margin of error is:

[tex]M = T\frac{s}{\sqrt{n}}[/tex]

In which s is the standard deviation of the sample(square root of the variance) and n is the size of the sample.

In this question:

[tex]s = 11.5, n = 100[/tex]. So

[tex]M = T\frac{s}{\sqrt{n}}[/tex]

[tex]M = 1.984\frac{11}{\sqrt{100}}[/tex]

[tex]M = 2.18[/tex]

The margin of error for a 95% confidence interval is of 2.18 hours.