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AysviL [449]
3 years ago
10

Ira wants to buy a skateboard. She paid $120 including the sales tax of 7%.

Mathematics
1 answer:
satela [25.4K]3 years ago
8 0
the original cost was $111.60.
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Mr. Wilson has $2,500 in his savings account and m dollars in his checking account Write an expression that describes the total
marissa [1.9K]

Expression: 2500 + m

Just substitute m with 300 and solve like that.

2500 + 300 = 2800

5 0
2 years ago
The art club wants to order T-shirts. The T-shirts cost $8.50 each plus a shipping fee of $6.
inessss [21]
A. c = $8.50t + $6

b. $133.50
5 0
3 years ago
The overhead reach distances of adult females are normally distributed with a mean of 205 cm205 cm and a standard deviation of 8
bekas [8.4K]
A) the probability is 0.123 or 12.3%.
B) the probability is 0.8589 or 85.89%.
C) the normal distribution can be used even though the sample is small because the population the sample is taken from is normally distributed.

Explanation
A) We first find the z-score that corresponds with this value.
z=\frac{X-\mu}{\sigma}
\\
\\=\frac{215-205}{8.6}= 1.1628

Using a z-table (http://www.z-table.com) we find 1.16; this corresponds to a probability of 0.8770.  However, This is the probability that a number will be lower than this; since we want the probability that the value is higher, we subtract from 1:

1-0.8770 = 0.123.

B) To find the probability of a sample mean, we use the formula
z=\frac{X-\mu}{\frac{\sigma}{\sqrt{n}}}
\\
\\=\frac{202.8-205}{\frac{8.6}{\sqrt{15}}}=-0.9908

Looking in our z-table we see that this corresponds with 0.1611.  Again, however, this is the area left of this value, which is the probability below; we want the probability above, so we subtract from 1:

1-0.1611 = 0.8589
5 0
3 years ago
The domain of a quadratic function is all real numbers and the range is y ≤ 2 how many x intercepts does the function have?
Assoli18 [71]

Answer:3

Step-by-step explanation:

3 0
3 years ago
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6x^3 -24x^2 24x
3x^2 -12x 12
4 0
2 years ago
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