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krok68 [10]
3 years ago
8

At the gift shop, they sell small greeting cards and large greeting cards. The cost of a small greeting card is $ 2.50 and the c

ost of a large greeting card is $3.85. How much would it cost to get 4 small greeting cards and 5 large greeting cards? How much would it cost to get small greeting cards and y large greeting cards ?
Mathematics
1 answer:
lesantik [10]3 years ago
4 0

Answer: X-

Step-by-step explanation:

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How to solve equations with the substitution method
Paul [167]

Answer:

In a system, the substitution method is one of the 3 main ways to solve a system and can be very efficient at times.

<u>Skills needed: Systems, Algebra</u>

Step-by-step explanation:

1) Let's say we are given two equations below:

  y=4x \\ 4x-5y=-32

  We can use substitution here by substituting in for y in the second equation.   This means we put in 4x for y in the 2nd equation so we only have x variables in the equation, allowing us to solve for x.

2) Solving it out:

1) 4x-5(4x)=-32 \\ 2) 4x-20x=-32 \\3) -16x=-32 \\4)x=2\\5)y=4x = 4(2) = 8 \\ 6)y=8

We essentially substitute in that value as seen in step 1. Steps 2 and 3 are just simplifying the left side and allowing for us to solve. Step 4 is where we divide by -16 on both sides to solve for x. Step 5 and 6 show us solving for y using the value for x. We get x=2,y=8

5 0
2 years ago
Read 2 more answers
What is 299,864 times 5?
irakobra [83]

Answer:

1,498,420

Step-by-step explanation:

6 0
3 years ago
Find the area of the segment (unshaded area) of Circle G with radius 4in. Round to the nearest tenth.
Romashka [77]

Angle is 90°

The sector is 1/4 th of circle

Area of sector

  • πr²/4
  • π(4)²/4
  • 4πin²

Triangle is right angled

Area

  • 1/2(4)²
  • 16/2
  • 8in²

Area of unshaded region

  • 4π-8
  • 4(π-2)
  • 4(3.14-2)
  • 4(1.14)
  • 4.56in²
4 0
1 year ago
Read 2 more answers
Which graph represents the system of inequalities?<br><br> y+2&lt;5x<br> y+3x&gt;4<br> y≥2x
Lostsunrise [7]

Answer:

2nd graph above the one you chose

4 0
2 years ago
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an est
nirvana33 [79]

Answer:

The 80% confidence interval for the mean number of words a third grader can read per minute is between 40.4 wpm and 40.8 wpm.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.8}{2} = 0.1

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.1 = 0.99, so z = 1.28

Now, find M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.28*\frac{4.1}{\sqrt{840}} = 0.2

The lower end of the interval is the sample mean subtracted by M. So it is 40.6 - 0.2 = 40.4 words per minute.

The upper end of the interval is the sample mean added to M. So it is 40.6 + 0.2 = 40.8 words per minute.

The 80% confidence interval for the mean number of words a third grader can read per minute is between 40.4 wpm and 40.8 wpm.

3 0
3 years ago
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