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2 years ago

42 of the 50 coffee mugs at Nicole's Pancake House are dirty. What percentage of the

Mathematics

2 answers:

LenKa [72]2 years ago

5 0

Answer:

84%

Step-by-step explanation:

of the means division.

42/50 = 84/100 = 84%

TiliK225 [7]2 years ago

4 0

16% of the mugs are dirty

42/50

84/100

100-84=16

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Calculate the product of and 1/5 +2/9=

Phantasy [73]

$\frac{1}{5}~+~ \frac{2}{9}$

Find the same denominators

$\frac{9}{45}~+~ \frac{10}{45}$

$\frac{9~+~10}{45}$

$\frac{19}{45}$

Answer = $\frac{19}{45}$

5 0

3 years ago

Read 2 more answers

Combine like terms.<br> By – 4z + 3y + 5z = 11y + [? ]z

Sliva [168]

Answer:

11y + 1z

Step-by-step explanation:

Like terms are ones that have the same variable (or set of variables).

8y - 4z + 3y + 5z

= (8 +3)y +(-4 +5)z

= 11y +1z

Usually written as 11y+z.

7 0

4 years ago

Prove this <br><br> 1-tan^2x/1+tan^2x=cos^2x-sin^2x

tatiyna

Answer:

see explanation

Step-by-step explanation:

Using the identity

tan x = $\frac{sinx}{cosx}$

Consider the left side

$\frac{1-tan^2x}{1+tan^2x}$

= $\frac{1-\frac{sin^2x}{cos^2x} }{1+\frac{sin^2x}{cos^2x} }$ ( multiply numerator and denominator by cos²x to clear fractions

= $\frac{cos^2x-sin^2x}{cos^2x+sin^2x}$ ← ( cos²x + sin²x = 1 ]

= cos²x - sin²x

= right side , thus proven

7 0

2 years ago

I am stuck on this question of knowing how to break it down to get the answer

maksim [4K]

3 x 3 - ( (-1)^2 - 2)^2

Start evaluating the one in the most inner bracket:
3 x 3 - ( (-1)^2 - 2)^2
= 3 x 3 - (1 - 2)^2

There is one more bracket, so we do what is in the bracket:
3 x 3 - ( (-1)^2 - 2)^2
= 3 x 3 - (1-  2)^2
= 3 x 3 - (-1)^2
= 3 x 3 - 1

Between x and -, we do the x first:
3 x 3 - ( (-1)^2 - 2)^2
= 3 x 3 - (1-  2)^2
= 3 x 3 - (-1)^2
= 3 x 3 - 1
= 9 - 1

Then we do the -:
3 x 3 - ( (-1)^2 - 2)^2
= 3 x 3 - (1-  2)^2
= 3 x 3 - (-1)^2
= 3 x 3 - 1
= 9 - 1
= 8

7 0

3 years ago

What integer is equivalent to 9 3/2

umka21 [38]

First off, we change the mixed fraction to "improper" and then we make it a decimal.

$\bf \stackrel{mixed}{9\frac{3}{2}}\implies \cfrac{9\cdot 2+3}{2}\implies \stackrel{improper}{\cfrac{21}{2}}\implies 10.5 \ne \mathbb{Z}$

an integer is a "whole" number, with no decimals.

3 0

3 years ago