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3 years ago

Ayuda con estos ejercicios

Mathematics

1 answer:

joja [24]3 years ago

3 0

1. x=6
2. y=6
3. x=10
4. y=10

1.c+9= 19
2. 9-y=7
3. 5y=30
4. u-u=0

1. 2(3x2 - 5x3)
2(6-15)
2x(-9)=18

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teachers for several classes and a district are told to use a new method for teaching reading while all the other classes use tr

OLEGan [10]

The correct answer is:

Experiment

Explanation:

In an experiment, one group is given a treatment while at least one other group is not. After the treatment is finished, the results of the group that receive the treatment are compared with the results of the group (or groups) that do not receive the treatment, to determine if the treatment had any effect on the group.

In this problem, the different groups are the classes. Some classes use the new method, which is the treatment, while other classes do not. At the end of the year, the reading results of each class are compared to see if the treatment (new method) had any effect.

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4 years ago

Read 2 more answers

Evaluate 4x2 +3 when x=5

Molodets [167]

Answer:

103

Step-by-step explanation:

We substitute x with 5:

$4(5)^2+3$

Solve the exponent first:

$5^2 = 25$

Note: We are using order of operations (consecutively)

Parentheses
Exponents
Multiplication
Division
Addition
Subtraction

Multiply:

25 * 4 = 100

Add:

100 + 3 = 103

Our answer is 103

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3 years ago

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5. One canned juice drink is 15% orange juice; another is 10% orange juice. How many liters of each should be mixed together in

hram777 [196]

X: liters of 15% orange juice
y: liters of 10% orange juice

x+y=5L

y=5L - x

x liters of 15% orange juice plus y liters of 10% orange juice makes 5 liters of 12% orange juice in equation form:

0.15x+0.10y = 0.12(5L)

0.15x+0.10(5L-x)=0.12(5L)

0.15x+0.5-0.10x=0.6

0.05x=0.1L

x=2L

so y = 3L

so you need 2 liters of 15% orange juice and 3 liters of 10% orange juice

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The mean of a frequency distribution is given by

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3 years ago

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-BARSIC- [3]

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Step-by-step explanation:

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