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4 years ago

Solve the equation 9 equals negative d + 17

Mathematics

2 answers:

pshichka [43]4 years ago

6 0

Step-by-step explanation:

1. substract 17 to both sides

2. know you have -8=-d

3. divide both sides by -1 in order to get a positive answer

4. total answer d= 8

crimeas [40]4 years ago

4 0

Answer:

Step-by-step explanation:

9=-d+17

(add d to both sides because it is the opposite of subtracting)

9+d=17

(subtract 9 from both sides because it is the opposite of adding)

d=17-9=8

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The san paulo community swimming pool can be filled in 12 hr if water enters through a pipe alone or in 30 hr if water enters th

Nuetrik [128]

Alright, lets gets started.

If water enters through a pipe alone, swimming pool can be filled in 12 hr.

Or say, in 12 hrs, swimming pool can be filled with help of pipe.

It means in 1 hr, the part of swimming pool filled = $\frac{1}{12}$ (For pipe only)

Similarly, with hose only, , in 1 hr, the part of swimming pool filled = $\frac{1}{30}$

So, water is coming from both, pipe and hose , then in 1 hr, the part of pool filled will be = $\frac{1}{12} + \frac{1}{30}$

Suppose in x hrs, with both supplies, pipe and hose, pool is filled.

Means

$\frac{1}{12} + \frac{1}{30} = \frac{1}{x}$

making common denominator

$\frac{30}{360} + \frac{12}{360} = \frac{1}{x}$

$\frac{30 + 12}{360} = \frac{1}{x}$

$\frac{42}{360} = \frac{1}{x}$

Flipping

$\frac{360}{42} = x$

$x = \frac{60}{7}$

Means 8.57 hrs : Answer

Hope it will help :)

7 0

3 years ago

Can i have some help pls

Bingel [31]

Answer:

15 girls

Step-by-step explanation:

In all, there are 7+5 = 12 equal groups of students in the class, that in total make 36 people.

So there are 3 students in each small group.

Answer.

There are 7*3 = 21 boys and 5*3 = 15 girls.

8 0

3 years ago

What are the vocab words that match these math definitions?

NikAS [45]

The first answer is exponent
And the second answer is base

5 0

3 years ago

Jenn went shopping and spent $112. She bought a book for $24 and CD's that cost $8 each. What equation would you use to find out

slavikrds [6]

I would use the equation
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let x = the amount of CDs she bought.

Hope this helps!!

3 0

3 years ago

A rational expression had been simplified below.

Lina20 [59]

I agree. All real numbers except -1.

4 0

3 years ago

Read 2 more answers