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Neporo4naja [7]
3 years ago
9

Hey please help me with this one.- Find the value fd a

Mathematics
1 answer:
valkas [14]3 years ago
5 0

Answer: a = 15

Step-by-step explanation:

6a + 10 = 3a + 55

Subtract 10 from both sides

6a = 3a + 45

Subtract 3a from both sides

3a = 45

Divide each side by 3

a = 15

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2 peaple.

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Convert the measurement:
slava [35]

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7.62 is the answer

Step-by-step explanation:

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4 years ago
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twenty of the students in Hannah's class, or 80% of the class, voted to have pizza for lunch every Wednesday. How many students
Igoryamba

Answer:

There are 25 students in Hannah's class.

Step-by-step explanation:

If 20 students in Hannah's class is 80% of the total amount of students, we can use a variable to figure out the total amount of students.

Let's say x is the total amount of students. We can use this equation to solve the problem:

20 = .8x

This is saying 20 equals 80% (.8 when you move the decimal 2 times) of x, or the total amount of students. Let's solve.

20 = .8x

Divide by .8

25 = x

There are 25 students in Hannah's class.

6 0
4 years ago
Hi I rlly could use some help with this! I'm not the best at math and I'm rlly struggling with this assignment its a couple ques
snow_lady [41]

1. Let <em>y</em> represent the amount of money earned, and <em>x</em> the number of cars they wash. Then

<em>y</em> = 5<em>x</em>

Why? Each car wash costs $5. So no car washes means no earnings; 1 car wash earns $5; 2 washes earn $10; 3 washes earn $15, and so on, so that <em>x</em> car washes generate $5<em>x</em>.

2. No matter how many cars they end up washing, they will have spent $75 to set up the operation, so you subtract 75 from the equation is part (1).

3. Taking into account the setup cost of $75, the profit they make is given by

<em>y</em> = 5<em>x</em> - 75

4. When <em>x</em> = 0, meaning no cars get washed, the profit is -$75, meaning the team loses $75.

5. Set the profit function equal to 0 and solve for <em>x</em> :

5<em>x</em> - 75 = 0

5<em>x</em> = 75

<em>x</em> = 75/5

<em>x</em> = 15

So the team has to wash at least 15 cars to break even.

5 0
3 years ago
Read 2 more answers
How many different four-digit numbers can be formed with the numbers 7; 4; 5; 1; 2; 9; and 8?
vodomira [7]
Two answers are possible.
One is with the repetition of digits.
The other is without repetition of digits.
ANSWER 1: With Repetition
Numbers: 1,2,4,5,7,8
There are 4 digits __ __ __ __
1st digit can be filled by any of the 6 numbers.
Similarly 2nd, 3rd and 4th digits.
Hence each digit will have 6 possibilities.
Therefore no.of 4 digit numbers that can be formed are 6 x 6 x 6 x 6 = 1296
ANSWER 2: Without Repetition
4 digits __ __ __ __
Now the first digit can be filled by any of the six numbers. Therefore there are 6 possibilities
The second digit will have only 5 possibilities as one of the numbers gets used up by the 1st digit.
Similarly the 3rd and 4th digits will have 4 and 3 possibilities respectively.
Therefore no.of 4 digit numbers that can be formed are 6 x 5 x 4 x 3 = 360
8 0
3 years ago
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