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earnstyle [38]
3 years ago
13

Serena bought a total of 135 notebooks and pencils for her students. Each notebook cost $1.75, and each pencil cost $0.35. The t

otal cost of her purchase was $122.85. How many pencils did Serena buy?
Mathematics
1 answer:
notsponge [240]3 years ago
8 0

Answer:

81 pencils is the answer

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Suppose that a sample mean is .29 with a lower bound of a confidence interval of .24. What is the upper bound of the confidence
Ganezh [65]

Answer:

The upper bound of the confidence interval is 0.34

Step-by-step explanation:

Here in this question, we want to calculate the upper bound of the confidence interval.

We start by calculating the margin of error.

Mathematically, the margin of error = 0.29 -0.24 = 0.05

So to get the upper bound of the confidence interval, we simply add this margin of error to the mean

That would be 0.05 + 0.29 = 0.34

3 0
3 years ago
Emily added 5 grams of water into 20 grams of 50% salt solution. She made ___ grams of ___% salt solution.
yaroslaw [1]
For the first blank, the answer should be the total weight of the solution which is derived from adding 5 grams and 20 grams. The answer would be,

        T = 5 + 20 = 25 grams

For the second blank, the % solution is derived by dividing the amount of salt initially by the total amount of the resulting solution. This is as shown below.

      C = ((20 x 0.5) / 25) x (100%)
 
Simplifying,
      C = 40%

Answers: 
    a. 25 grams
    b. 40%
8 0
3 years ago
Bianca has to drive 180 miles to her aunts house. She drove 30% of the total distance before lunch. How many miles did Bianca dr
Rom4ik [11]
180 times 0.3 would get you the answer. 54 miles would be the answer.

BIANCA DROVE 54 MILES BEFORE LUNCH


6 0
3 years ago
Find the value of y and simplify completely
Law Incorporation [45]

Here we have three similar triangles

In similar triangles sides are in proportion

The altitude to the hypotenuse of a right triangle is the mean proportional between the segments into which it divides the hypotenuse.

\frac{part of hypotenuse }{altitude} =\frac{altitude}{other part of hypotenuse}

\frac{16}{y} =\frac{y}{4}

We cross multiply to solve for y

y^{2} =64

Taking root of both sides

y=8

8 0
3 years ago
Pls help need it ASAP<br> :)
Elenna [48]

Answer:

x = 4

y = 13

Step-by-step explanation:

x + y = 17

y = 2x + 5

substitute for y:

x + (2x + 5) = 17

reduce:

3x + 5 = 17

subtract 5 from each side:

3x = 12

divide both sides by 3:

x = 4

y = 2(4) + 5

y = 13

6 0
2 years ago
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