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2 years ago

13

Does anyone know how to solve this?

1 answer:

dimulka [17.4K]2 years ago

7 0

Step-by-step explanation:

x-3=2x-13

x-2x= -13+3

-x= -10

remove the two minus sign

x=10

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in a class of 20 students, 40% are boys. 25% of the boys and 50% of the girls wear glasses. How man students wear glasses?

statuscvo [17]

20 students.

40% are boys. (40/100)*20 = 0.4 * 20 = 8 boys.
Girls= 20 - 8 = 12 girls.

25% of the boys wear glasses. = (25/100)*8 = 0.25*8 = 2 boys wear glasses.
50% of the girls wear glasses. = (50/100)*12 = 0.50*12 = 6 girls wear glasses.

Total students that wear glasses = 2 + 6 = 8 students.
8 students wear glasses.

7 0

2 years ago

Thomas walks 10 miles in 120 minutes. Select all of the unit rates below that

tatiyna

Answer:

Hi! The answer to your question is B) He can walk 12 miles in 1 minute.

To find Unit rate divide the biggest number by the smallest; Example: $120/10$

Step-by-step explanation:

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3 years ago

Can somebody give me a link to Maths Progress Core 2 active learn

ella [17]

Just get guath math it’s free and give every answer

6 0

3 years ago

at a concession stand, one person purchased 3 drinks a 3 soft pretzels for a total of $9.00. another person purchased 4 drinks a

gavmur [86]

<span>d=drinks
p=pretzels
1st eq. 3d+3p=9.00
2nd eq. 4d+2p=8.50</span>

multiply 1st eq by 2

6d+6p=18.00

<span>multiply 2nd eq by 3
12d+6p=25.50
subtract
-6d=-7.50
d=1.25
3p=9.00-3d</span>

3p=9-3.75

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p=1.75
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5 0

2 years ago

The two hexagonal pyramids are similar.

spayn [35]

Answer: The approximate surface area of the larger pyramid is 159.31 ft².

Step-by-step explanation:

A pyramid is a solid,

And, When two solids are similar then the ratio of their surface area is the square of the scale factor of similarity.

Here, the scale factor of similarity

$=\frac{\text{Height of larger pyramid}}{\text{Height of smaller pyramid}}$

$=\frac{15}{6}$

Thus, by the above property,

$\frac{\text{ The surface area of larger pyramid}}{\text{The surface area of the smaller pyramid}}=(\frac{15}{6})^2$

It is given that, the smaller pyramid has a surface area of 25.49 ft²,

$\implies \frac{\text{ The surface area of larger pyramid}}{25.49}=\frac{225}{36}$

$\text{ The surface area of larger pyramid} = \frac{25.49\times 225}{36}$

$=\frac{5735.25}{36}$

$=159.3125\approx 159.31\text{ square ft}$

8 0

2 years ago

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