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Rudiy27
3 years ago
13

In Chad's reading class, all the students are reading the same book. The school bought each student a book at $7 per book. If th

ere are 27 students in Chad's class, which of the following expressions could not be used to calculate the total cost?
a. 7(30) - 7(7)
b. 7(20) + 7(7)
c. 7(30) - 7(3)
Mathematics
2 answers:
Molodets [167]3 years ago
8 0

It would be A. 7(30) - 7(7)


natka813 [3]3 years ago
5 0

Answer:

a. 7(30) - 7(7)

Step-by-step explanation:

Given,

The total number of students = 27,

∵ Every student gets a book of $ 7,

So, the total cost ( in dollars ) = price of each book × total student  

= 7 × 27

= 7(27)

∵ 7(30) - 7(7) = 7(30-7) = 7(23) ≠ 7(27)

7(20) + 7(7) = 7(20+7) = 7(27)

7(30) - 7(3) = 7(30-3) = 7(27)

Hence, option 'a' is correct.

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kkurt [141]
Total  boxes of cookies =140

Boxes sold = 60% of 140 
Boxes sold = 0.6 x 140
Boxes sold = 84 

Boxes sold that contained mint cookies = 1/4 of 84
Boxes sold that contained mint cookies = 21

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Answer: Lauren sold 21 boxes of mint cookies.
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4 0
4 years ago
Verify each of the following by evaluating the logarithms.<br> log10(103) + log10(104) = log10(107)
ioda

Answer:

log₁₀(10³) + log₁₀(10⁴)

= log₁₀( 10³ × 10⁴ )

= log₁₀( 10³⁺⁴)

= log₁₀( 10⁷)

Step-by-step explanation:

Given:

log₁₀(10³) + log₁₀(10⁴) = log₁₀(10⁷)

Now,

we know the property of log function that

log(A) + log(B) = log(AB)

therefore,

applying the above property on the LHS, we get

log₁₀(10³) + log₁₀(10⁴) = log₁₀( 10³ × 10⁴ )

also,

xᵃ + xᵇ = xᵃ⁺ᵇ

therefore,

log₁₀( 10³ × 10⁴ ) = log₁₀( 10³⁺⁴)

= log₁₀( 10⁷)

Hence,

LHS = RHS

Hence proved

7 0
4 years ago
An auto parts chain asked customers to complete a survey rating the chain's customer service as average, above average, or below
Mandarinka [93]

Answer:

The right answer is "0.33".

Step-by-step explanation:

As per the question,

n = 15

Average will be "x = 5"

Now,

The required proportion will be:

⇒ p=\frac{x}{n}

By putting the values, we get

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Thus, the above is the appropriate solution.

8 0
3 years ago
Number 14 please thanks
katrin [286]
Your problem is:
$35.00 is what percentage of $437.50?

If you are given a part and the whole, and you want to know what percent the part is of the whole, divide the part by the whole and multiply by 100.

In this case, the whole is $437.50.
The part is $35.00.

35/437.5 * 100 = 8%

3 0
3 years ago
3x+2y=5 and 2x+2y Elimination method...help please​
Norma-Jean [14]
3x+2y=5
2x+2y=0

The solutions are: x=5, y=-5


8 0
3 years ago
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