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3 years ago

Barbara charges $3.50, plus $2.25 for each hour she babysits. If Barbara charges $21.50, how many hours does she babysit?

Mathematics

1 answer:

MAVERICK [17]3 years ago

8 0

Answer:

8 hours

Step-by-step explanation:

The equation is 2.25X + 3.50 = 21.50

X represents the unknown amount of hours she worked. 2.25 is the cost per hour. 3.50 is the fee she charges for every gig. That fee only happens once a gig so naturally it wasn't the number x was placed with.

2.25X + 3.50 = 21.50

2.25X + 3.50 - 3.50 = 21.50 - 3.50

2.25X = 18

2.25 2.25

X = 8

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12x=4

x= 4/12

<h2>Answer: x=1/3</h2>

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3 years ago

Which expression is equivalent to 454•41/4 /1/2 4. 1/2

givi [52]

Answer:

Step-by-step explanation:

if you work inside parentheses first you get:

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3 years ago

Can anyone please help me with 1-18

ruslelena [56]

Answer:

a. 15 on top 8 on bottom

b. 2 on top -3 on bottom

c. 4 and 2

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Step-by-step explanation:

multiply the two numbers on the sides to get the top answer and add them together to get the bottom answer.

6 0

3 years ago

A chemist has two alloys, one of which is 5% gold and 20% lead and the other which is 30% gold and 50% lead. How many grams of e

dmitriy555 [2]

The amount of the first alloy is 450 grams and the amount of the second alloy is 30 grams.

<h3>What is a linear equation?</h3>

It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.

If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.

We have:

A chemist has two alloys, one of which is 5% gold and 20% lead and the other which is 30% gold and 50% lead.

Let's suppose the x is the amount of the first alloy and y is the amount of the second alloy:

We can make two linear equation in two variables:

0.05x + 0.3y = 31.5 ...(1)

0.2x + 0.5y = 105 ...(2)

After solving the above two linear equations by substitution method, we get:

x = 450 grams

y = 30 grams

Thus, the amount of the first alloy is 450 grams and the amount of the second alloy is 30 grams.

Learn more about the linear equation here:

brainly.com/question/11897796

#SPJ1

3 0

2 years ago

Shaikha sold 10 packages of sugar cookies and 2 packages of oatmeal cookies for $56. Khalid sold 9 packages of sugar cookies and

ale4655 [162]

Answer:

The system that can be used is:

$10x + 2y = 56$

$9x + 3y = 60$

Step-by-step explanation:

We have that:

x is the price of a package of sugar cookies, y is the price of a package of oatmeal cookies.

Shaikha sold 10 packages of sugar cookies and 2 packages of oatmeal cookies for $56.

This means that:

$10x + 2y = 56$

Khalid sold 9 packages of sugar cookies and 3 packages of oatmeal cookies for $60.

This means that $9x + 3y = 60$

System that can be used:

The system that can be used is:

$10x + 2y = 56$

$9x + 3y = 60$

4 0

3 years ago