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3 years ago

Where does my sister put brackets at?

Mathematics

2 answers:

lutik1710 [3]3 years ago

8 0

$3 \times (4 - 1) + 2 = 3 \times 3+2=11$

antoniya [11.8K]3 years ago

4 0

Put the brackets around 4-1

Using the rules of PEMDAS, the brackets would go first (4-1 is 3), then you would do the multiplication (3×3 is 9), and then finally the addition (9+2 is 11).

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If 7x = 24 y, find the ratio of x to y.

MArishka [77]

Answer:

7:24 or $\frac{7}{24}$

Step-by-step explanation:

a ratio is usually defined as a fraction ( the first to the next)

8 0

2 years ago

Peter has twice as many stickers as Joe. Joe has 40 more stickers than Emily. They have 300 Stickers altogether. How many sticke

GarryVolchara [31]

Answer:

170

Step-by-step explanation:

Equations derived from given info.

P=2J
J=E+40
P+J+E=300

Use some substitution now.

P=2(E+40)
J=E+40
P+J+E=300

Substitute first and second equation into third.

2(E+40)+E+40+E=300
2E+80+E+40+E=300
4E+120=300
4E=180
E=45

Emily has 45 stickers. But we want to know what Peter has.

Use P=2(E+40)

P=2(45+40)
P=90+80
P=170

Peter has 170 stickers.

4 0

3 years ago

The width of a rectangle is 4 1/6 feet, and its area is 35 square feet. What is the perimeter of this rectangle?

DanielleElmas [232]

Answer:

perimeter = 25.13feets

Step-by-step explanation:

width = 25/6 feet

Area = 35 square feet

lenght = Area/width = (35*6)/25 = 8.4feets

perimeter of the rectangle = 2(25/6 + 8.4) = 25.13 feets

5 0

3 years ago

If f(x)=ln(sin(2x)), f''(π/4) is equal to

Licemer1 [7]

Use the chain rule to compute the second derivative:

$f(x)=\ln(\sin(2x))$

The first derivative is

$f'(x)=(\ln(\sin(2x)))'=\dfrac{(\sin(2x))'}{\sin(2x)}=\dfrac{\cos(2x)(2x)'}{\sin(2x)}=\dfrac{2\cos(2x)}{\sin(2x)}$

$f'(x)=2\cot(2x)$

Then the second derivative is

$f''(x)=(2\cot(2x))'=-2\csc^2(2x)(2x)'$

$f''(x)=-4\csc^2(2x)$

Then plug in π/4 for <em>x</em> :

$f''\left(\dfrac\pi4\right)=-4\csc^2\left(\dfrac{2\pi}4\right)=-4$

4 0

3 years ago

In the following addition problem, the letters A,B,C stand for three different digits. What digits should replace each letter?

Eva8 [605]

Alright so I got A=4, B=5 and C=9

A B C
+ A C B
----------
C B A

459
+ 495
--------
954

8 0

3 years ago