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3 years ago

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What should be done so that the expression will have a value of 10? 12 - 2 + 22 ÷ 8 Add parentheses around 2 + 2. Add parenthese

s around 12 - 2. Add parentheses around 2 2 ÷ 8. Nothing needs to be done.

1 answer:

mariarad [96]3 years ago

4 0

12-2+22/8 (=12.75 so the option of doing nothing isn't right)

12-(2+2)2/8 (=11 so that option is gone)

(12-2)+22/8 (=12.75 so that option is gone as well)

12-2+(22/8) (=12.75 So that's gone as well)

?????

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1. At the school bookstore, Harrison purchases 3 notebooks for $2.50 each, 10 pens for $0.35 each, and 5 mechanical pencils for

Artemon [7]

Find cost of pens and mechanical pencils

pen cost=number of pens times cost pe pen
pencost=10 times 0.35=3.50

mech cost=number of mechs times cost pe mech
mechcost=5 times 0.89=4.45

4.45 is more than 3.50
yes, mech cost mre than pens

8 0

3 years ago

What is the solution to log Subscript 5 Baseline (x + 30) = 3

GarryVolchara [31]

Answer:

The correct option is option (d).

Step-by-step explanation:

Logarithms are used basically to express large number.

Rules:

$log_a(M.N)= log_aM+log_aN$
$log_a(\frac{M}{N})= log_aM-log_aN$

$log_a(M^k)=klog_aM$

$log_a(1)=0$

$log_a(a)=1$

$b^{log_{b}k}=k$

$log_ab=c \Leftrightarrow b=a^c$

Here given that,

$log_5(x+30)=0$

Applying the last rule

$\Rightarrow (x+30)= 5^3$

$\Rightarrow x+30 = 125$

⇒x=125-30

⇒x=95

Therefore x=95.

5 0

3 years ago

Read 2 more answers

Find the dimensions of a rectangle (in m) with area 1,000 m2 whose perimeter is as small as possible. (Enter the dimensions as a

Amanda [17]

The perimeter of the rectangle is the sum of its dimensions

The dimensions that minimize the perimeter are $\mathbf{10\sqrt{10 },10\sqrt{10 }}$

The area is given as:

$\mathbf{A = 1000}$

Let the dimension be x and y.

So, we have:

$\mathbf{A = xy = 1000}$

Make x the subject

$\mathbf{x = \frac{1000}{y}}$

The perimeter is calculated as:

$\mathbf{P = 2(x + y)}$

Substitute $\mathbf{x = \frac{1000}{y}}$

$\mathbf{P = 2(\frac{1000}{y} + y)}$

Expand

$\mathbf{P = \frac{2000}{y} + 2y}$

Differentiate

$\mathbf{P' = -\frac{2000}{y^2} + 2}$

Set to 0

$\mathbf{ -\frac{2000}{y^2} + 2 = 0}$

Rewrite as:

$\mathbf{ -\frac{2000}{y^2} = -2}$

Divide both sides by -1

$\mathbf{\frac{2000}{y^2} = 2}$

Multiply y^2

$\mathbf{2000 = 2y^2}$

Divide by 2

$\mathbf{1000 = y^2}$

Take square roots of both sides

$\mathbf{y = \sqrt{1000 }}$

$\mathbf{y = 10\sqrt{10 }}$

Substitute $\mathbf{y = \sqrt{1000 }}$ in $\mathbf{x = \frac{1000}{y}}$

$\mathbf{x = \frac{1000}{\sqrt{1000}}}$

$\mathbf{x = \sqrt{1000}}$

$\mathbf{x = 10\sqrt{10 }}$

Hence, the dimensions that minimize the perimeter are $\mathbf{10\sqrt{10 },10\sqrt{10 }}$

Read more about perimeters at:

brainly.com/question/6465134

8 0

3 years ago

sphere and a cylinder have the same radius and height. The volume of the cylinder is 54 meters cubed. Amie found the volume of t

Fiesta28 [93]

Answer:

Amie should have multiplied 54 by 2/3

Step-by-step explanation:

The formula of the volume of a sphere is given by

$\frac{4}{3}\pi r^3$ , where r is the radius of the sphere.

to find the volume of the sphere, we must find $r^3$

We know that the formula of a cylinder of height h and radius r is given by

$\pi r^2h$

So $54 = \pi r^2 h$

We know that the sphere and the cylinder have the same height. Recall that the height of the sphere of radius r, is the diameter of a circle that passes through the heighest and lowest points of the sphere. Then, h=2r. This means that

$54 = 2\pi r^3$

From here, we know that $\pi r^3 = \frac{54}{2}$ .

So the volume of the sphere is $\frac{4}{3}\frac{54}{2} = \frac{2}{3}\cdot54$ .

So Amie should have multiplied 54 by 2/3.

4 0

4 years ago

Read 2 more answers

Plzzzz need answers

babymother [125]

46) 44.9706

47) 38.9706

Hope this helps! ;)

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3 years ago