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S_A_V [24]
3 years ago
15

Evaluate the expression 5c-2 for c=5

Mathematics
1 answer:
Setler [38]3 years ago
6 0
<h3>Answer:  23</h3>

Explanation:

Replace c with 5. Use PEMDAS to simplify

5c - 2 = 5*5 - 2 = 25 - 2 = 23

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Z varies jointly as x and y. z=60 when x=5 and y=6. find z when x = 7 and y=3
Aneli [31]

Answer:

z = 42

Step-by-step explanation:

The question can be answered in 2 steps as follows:

Step 1: Calculation of the constant of the variation

The equation for the joint variation can be given as follows:

z = cxy ................... (1)

Where;

z = 60

c = constant = ?

x = 5

y = 6

Substituting the values into equation (1) and solve c, we have:

60 = c * 5 * 6

60 = c * 30

c = 60 / 30

c = 2

Step 2: find z when x = 7 and y = 3

Since from Step 1 c = 2, we now use equation (1) and substitute the values into it to find z as follows:

z = 2 * 7 * 3

z = 42

4 0
3 years ago
8. How long will it take Seb to run 4000 m at an average speed of 5 m/s?
meriva

Answer:

Seb will take 13 minutes and 20 seconds  to run 4000 m at an average speed of 5 m/s

Step-by-step explanation:

time taken = distance / speed

time taken = 4000/5

time taken = 800 seconds

time taken = 13 minutes and 20 seconds

5 0
2 years ago
Read 2 more answers
Try it<br> Solve the system of equations.<br> 2x + 3y = 1<br> 5x + 2 = 8<br> What is the solution?
Stella [2.4K]

Answer:

x=6/5 ,y= -7/15

Step-by-step explanation:

we are going to solve this simultaneously.

2x+3y=1.......(i)

and

5x+2=8

5x=6

x= 6/5 .......(ii)

Now let's put value of x into equation number (i)

2x+3y=1

2(6/5) +3y=1

12/5 +3y =1

3y= 1-(12/5)

3y = -7/5

y = (-7/5) ÷3

y= -7/15

3 0
3 years ago
1/2(3)(5+7) whats the answer?
lina2011 [118]
First add what's in the parenthesis 1/2(3)(12)
then multiply 2 and 12 to get 1/2(36)
finally divide 36 by 2 and get 13
6 0
3 years ago
Read 2 more answers
Solve 56 &gt; -7x <br> Thank you!
Whitepunk [10]

Answer:

-8 > x

Step-by-step explanation:

56 divided by -7 = -8

-8 > x

make sure to double check before turning it in!

3 0
2 years ago
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