1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Morgarella [4.7K]
3 years ago
10

8z-13=7 what's the number that replaces z

Mathematics
2 answers:
jekas [21]3 years ago
8 0
8z-13=7 (first, add 13 to both sides)
8z=20
z=20/8
=10/4
=5/2
=2.5
Goshia [24]3 years ago
4 0
All you do is solve for z. So 8z-13=7. To solve for a variable you have to do the opposite to cancel out the numbers on each side. First you add 13 over to 7 to cancel out 13 on the z side. So 8z=20 is what you have left. Then you divide 8 on both sides to cancel out 8 on the z side. what you are left with is z=2.5. Lastly you plug and check. 8(2.5) - 13 = 7, 20-13=7. And thats correct so z is 2.5.
You might be interested in
If a equals 4b - 15 what is b
nlexa [21]

Answer:

b = a + 3.75

Step-by-step explanation:

a = 4b - 15

You are solving for b. Isolate the b. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. First, add 15 to both sides

a (+15) = 4b - 15 (+15)

a + 15 = 4b

Next, divide 4 from both sides. Remember to divide from all terms.

(4a + 15)/4 = (4b)/4

b = (4a)/4 + (15)/4

b = a + 15/4

b = a + 3.75 is your answer

~

7 0
3 years ago
Write an expression that represents sarah's total pay last week. represent her hourly wage with
Nostrana [21]
Whats her hourly wage and where is the rest of the question this is very confusing there are no details so i cannot help you sorry
5 0
3 years ago
Five cats each ate 1/4 cup of cat food. How much food did the five cats eat?
qaws [65]

Answer:  Five cats ate 1 and a quarter of cat food.


Step-by-step explanation

Given:-

Cat food ate by one cat = 1/4 cup

Cat food ate by five cats =5\times \frac{1}{4} \text{ [Multiplying both sides with 5 ]}\\\\=\frac{5}{4}=\frac{4+1}{4}=\frac{4}{4}+\frac{1}{4}=1+\frac{1}{4}=1 and 1/4 cup.

Therefore cat food ate by five cats = 1 and a quarter of cup.[ here a quarter =1/4]

7 0
3 years ago
What is 10 x 10 in exponential form
kiruha [24]

Answer:

40

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Find the time required for an investment of 5000 dollars to grow to 8300 dollars at an interest rate of 7.5
Nutka1998 [239]

Answer:

1.60 (rounded)

Step-by-step explanation:

I haven't done this in a while but you'd use the compound interest formula a=p(1+r)^n where a=8300 p=5000 r=0.075 and solve for n

4 0
2 years ago
Other questions:
  • Helppppppppppppppppppppppppppp meeeeeeeeeee
    5·1 answer
  • Equations with parentheses may require the use of the distributive property to be solve
    8·1 answer
  • Hayley and alex are counting their pocket money. hayley has three times as much money as alex. together they have £20 in total.
    8·1 answer
  • Please help I will mark Brainly
    6·1 answer
  • Write the standard equation of the circle with the given center is (0,0) and radius is 2.5
    13·1 answer
  • Which graph represents the solution set to the system of inequalities? Please help thank you!
    5·1 answer
  • Help im not good at math lol
    8·2 answers
  • What is the answer i need help
    6·1 answer
  • Find the average gas bill expense from the months: Oct $48, Nov. $57, Dec $61
    8·2 answers
  • Bluff is at a hardware store trying to decide what brand of wood glue to buy for his carpentry project 11. Ounces of Orangutan w
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!