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Leviafan [203]
2 years ago
7

Audrey bought shoes that were on sale for 70% off the regular price. Audrey saved $42.

Mathematics
2 answers:
sergeinik [125]2 years ago
6 0

Answer:

$60

Step-by-step explanation:

42 ÷ 70%

Calculate

\frac{42}{0.7} Multiply both the numerator and denominator with the same integer

\frac{420}{7} Cross out the common factor

Answer= $60

solniwko [45]2 years ago
5 0
60 because .7 times 60 equals 42 therefore the answer is 60
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Algebra 2 help please! I thought i got this one right but it’s wrong.
daser333 [38]

Answer:

area = 6x^2+10x-4 perimeter= 5x+3

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Find an explicit formula for the arithmetic sequence 12, 5, -2, -9,...
Vadim26 [7]

Answer:

an = 12 -7(n-1)

an = 19-7n

Step-by-step explanation:

The explicit formula for an arithmetic sequence is

an = a1 +d(n-1) where a1 is the first term and d is the common difference

a1 =12

We find d by taking the second term and subtracting the first term

d = 5-12

d = -7

an = 12 -7(n-1)

We can simplify this

an = 12 -7n+7

an = 19-7n

4 0
3 years ago
Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) Without doing an
stepladder [879]

Answer:

Step-by-step explanation:

Given are 3 data sets with values as:

(i) 8 9 10 11 12   ... Mean =10

(ii) 7 9 10 11 13    ... Mean =10

(iii) 7 8 10 12 13   ... Mean =10

We see that  data set shows mean deviations as

(i) -2 -1 0 1 2  

(ii) -3 -1 0 1 3    

(iii) -3 -2 0 2 3  

Since variance is the square of std deviation, we find that std deviation is larger when variance is larger.

Variance is the sum of squares of (x-mean).  Whenever x-mean increases variance increases and also std deviation.

Hence we find that without calculations also (i) has least std dev followed by (ii) and then (iii)

(i) (ii) (iii) is the order.

b) Between (i) and (ii) we find that 3 entries are the same and 2 entries differ thus increasing square by 9-4 twice.  But between (ii) and (iii) we find that

increase in square value would be 4-1 twice. Obviously the latter is less.

6 0
3 years ago
Help please will mark brainless 25 points due today
harkovskaia [24]

here's the solution,

we know that, sum of <u>measures</u> of each interior angle of a <u>triangle</u> = <u>180°</u>

<u>F</u><u>igure</u><u> </u><u>1</u><u>.</u>

=》

40 + 32 + 9x + 9 = 180

=》

81 + 9x = 180

=》

9x = 180 - 81

=》

x =  \frac{99}{9}

=》

x = 11

<u>Figure</u><u> </u><u>2</u><u>.</u><u> </u>

=》

42 + 63 + 4x + 15 = 180

=》

120 + 4x = 180

=》

4x = 180 - 120

=》

4x = 60

=》

x =  \frac{60}{4}

=》

x = 15

<u>Figure</u><u> </u><u>3</u><u>.</u>

=》

45 + 45 + 3x - 21 = 180

=》

3x + 69 = 180

=》

3x = 180 - 69

=》

3x = 111

=》

x =  \frac{111}{3}

=》

x = 37

8 0
3 years ago
Read 2 more answers
in a class of 28 sixth graders all but one of the students are 12 years old. witch two data measurements are the same for the st
Doss [256]
Out of 28 kids there is one that isnt 12
so 27 kids are 12 years old
1 isnt
concluding that, that 6th grade might be 11
so 1 out of 28
1:28


5 0
3 years ago
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