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3 years ago

a student writes "the difference between 15 and the product of 5 and y" to describe the expression 5y-15.Explain the error.

1 answer:

7 0

The word 'difference' indicates the use of subtraction in a Mathematical sum

The error is that the sum could be 15 - 5y instead of 5y - 15

A subtraction sum does not have the commutative properties, meaning that we cannot do the sum in any order.

A sum 15 - 5y will give a different result with the sum 5y - 15 for the same value of y.

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When solving negative one over five(x − 25) = 7, what is the correct sequence of operations?

Rufina [12.5K]

Add 25 to both sides x-25 +25 =7 +25
x =32

7 0

3 years ago

Out of the 150 students at a summer camp, 72 signed up for canoeing. there were 23 students who signed up for trekking, and 13 o

True [87]

Answer:

Approximately 45% students signed up for neither canoeing or trekking.

Step-by-step explanation:

First we subtract the number of the students who signed up from the number of the total students to find the number of the students who did not signed up for either.

But there are 13 students who signed up canoeing and also for trekking.

Hence the number of students they signed up for activity is

72 + 23 - 13 = 82

And the number of students they not signed up for any activity is

150 - 82 = 68

so 68 students signed up neither for trekking nor canoeing. The percentage of those students are :

$\frac{68}{150}$ × 100 = 45.3333%

Approximately 45% students signed up for neither canoeing or trekking.

8 0

3 years ago

Compare each set of data. Determine which set shows greater variability.

alexdok [17]

Answer:hhfjb

Step-by-step explanation:hdbbcjb

3 0

3 years ago

Read 2 more answers

Comparison Keshawn goes to the store to buy milk for his baby sister. He sees the

GalinKa [24]

Answer:

he should buy 128 oz of milk for 6.49

Step-by-step explanation:

2.49 divided by 32 equals 7 cents unless your rounding which would be 8 cents

4.99 divided by 64 is 7 cents too 8 if rounding

6.49 divided buy 128 oz would equal 5 cents so it is the cheapest.

4 0

2 years ago

I need help with truth tables

Lerok [7]

The complete table of truth value for the composite proposition:

p q ¬ q p ∨ ¬ q (p ∨ ¬ q) ⇒ q

T T F T T

T F T T F

F T F T T

F F T T F

<h3>How to fill a truth table with composite propositions</h3>

In mathematics, propositions are structures that contains a truth value. There are two truth values in classic logics: True, False. Composite propositions are the result combining simpler propositions and operators. There are the following logic operators and rules:

Negation changes the truth value of the proposition into its opposite.
Disjunction brings out "true" value when at least one of the two propositions is so.
Conjunction brings out "true" value when the two propositions are so.
Conditional form brings out "true" value when both propositions are true or only the consequent is true or both propositions are false.

Now we present the complete table of truth value for the composite proposition:

p q ¬ q p ∨ ¬ q (p ∨ ¬ q) ⇒ q

T T F T T

T F T T F

F T F T T

F F T T F

To learn more on truth values: brainly.com/question/6869690

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2 years ago