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slamgirl [31]
3 years ago
7

Jenn bought 12 pens for $2 each and 6 pads of paper for $3 each. She was in a hurry and forgot to include the operations. She wr

ote 12 2 6 3 Place parentheses and operation signs to write an expression for the total cost of Jenn's purchase. How much did she spend?​
Mathematics
2 answers:
Margaret [11]3 years ago
6 0

(12 x 3) + (6 x 3) = 54

Step-by-step explanation:

First of all, the 12 penda should be multiplied by the amount each other them cost, and same goes with the pads of paper. After you multiplied both, you add them and there you have your answer.

Nadya [2.5K]3 years ago
5 0
(12 • 2) + (6 • 3)= 24+18= 42

In total she spent $42

Hope this helps!!
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Ne4ueva [31]
I am guessing that y  = 300.

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3 years ago
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In general, the intercept of the function F(X) = a•b^x is the point
Murljashka [212]

Answer:

(0,a)

Step-by-step explanation:

Given

f(x) = ab^x

Required

Determine the intercept

The intercept is at point: x = 0

So, we have:

f(0) = ab^0

f(0) = a*1

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So, the intercept is at point (0,a)

<em>None of the options is true</em>

7 0
2 years ago
Simplify: j + 5 + 5c
irina [24]
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3 years ago
Hi please help me thanksss<br>pls provide workings too thanks :)​
anygoal [31]

Step-by-step explanation:

Search for questions & chapters

Class 11

>>Maths

>>Trigonometric Functions

>>Trigonometric Equations

>>Solve for x: sin x + sin 2x...

Question

Bookmark

Solve for x:sinx+sin2x+sin3x=cosx+cos2x+cos3x in the interval 0≤x≤2π.

Medium

Solution

verified

Verified by Toppr

We write the given equation as

(sinx+sin3x)+sin2x=(cosx+cos3x)+cos2x

or 2sin2xcosx+sin2x=2cos2xcosx+cos2x

or sin2x(2cosx+1)=cos2x(2cosx+1)

or (sin2x−cos2x)(2cosx+1)=0

∴sin2x−cos2x=0 or 2cosx+1=0

If sin2x−cos2x=0, then tan2x=1,

Hence 2x=nπ+π/4

or x=(4n+1)

8

π

.(1)

If 2cosx+1=0, then cosx=−1/2 (2)

∴x=2nπ±

3

2π

or x=

3

6n±2

π

We seek values of x in the interval 0≤x≤2π

In this interval (1) gives

x=π/8,5π/8,9π/8,13π/8. (n=0,1,2,3)

and (2) gives x=2π/3,4π/3. (for n=0,1)

Thus we get the answer

x=π/8,5π/8,2π/3,9π/8,4π/3,13π/8.

4 0
2 years ago
The mean breaking strength of yarn used in manufacturing drapery material is required to be more than 100 psi. Past experience h
Ganezh [65]

Answer:

H0: μ = 100 ; H1: μ > 100 ;

Test statistic = 0.75 ;

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Kindly check explanation for the rest

Step-by-step explanation:

Given that :

H0: μ = 100

H1: μ > 100

Sample mean, x = 100.6 ; n = 9 ; sample Standard deviation, s = 2.4

Test statistic :

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Probability of not rejecting the null :

P = P(Z > 0.75) = 0.22663

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Zcritical at (1 - α) = 1.645

100 + 1.645*(2.4/3)

100 + 1.316 = 101.316

(x - μ) ÷ s/sqrt(n)

(101.316 - 102) ÷ 2.4 / sqrt(9)

-0.684 ÷ 0.8 = 0.75

= - 0.855

P(Z < - 0.855) = 0.1963 (Z probability calculator).

95% lower confidence interval :

x - error margin, E

E = Zcritical * s/sqrt(n)

E = 1.645 * 0.8 = 1.316

100.6 - 1.316 = 99.284

From part c :

Interval becomes ;

(99.284, 101.316) ; this interval contains the hypothesized mean value of 100. Hence we fail to reject the null.

8 0
3 years ago
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