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3 years ago

Hard I need help plz someone help!

Mathematics

1 answer:

Leona [35]3 years ago

8 0

Answer:

8 gallons

Step-by-step explanation:

Each rectangular face of the monument has an area of ...

A = bh = (9 ft)(39 ft) = 351 ft^2

The triangular face on top of that rectangle has an area of ...

A = (1/2)bh = (1/2)(9 ft)(10 ft) = 45 ft^2

So, one side of the monument has an area of ...

one side = (351 ft^2) +(45 ft^2) = 396 ft^2

The total area of all four identical sides is ...

surface area = (4)(396 ft^2) = 1584 ft^2

Each gallon covers 199 ft^2, to the number gallons required is ...

(1584 ft^2)/(199 ft^2/gal) ≈ 7.96 gal

Since only whole gallons can be purchased, 8 gallons of paint must be bought.

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4 mm of Ink A is added to 10 mm of ink B, forming a mixture of inks. Ink A contains 10% blue pigment. Ink B contains an unknown

ElenaW [278]

We know that the mixture has 14 mm of ink. Of these, 35% are blue pigment, hence the mixture contains 4.9 mm of blue ink. Ink A contains 10%*4mm=0.4mm of blue ink. The difference, 4.5 mm of blue ink must have come from ink B. Thus ink B contains 4.5 mm of blue ink and is in total 10mm. After that, we can calculate the percentage; we divide 4.5/10=0.45 and this is the ratio of blue ink to total ink (in Ink B). If we transform it to percentages it is 45%

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4 years ago

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Use the correct order of operations to evaluate the following expression:(5+4).5+3.3

horsena [70]

Answer:

For any mathematical expression follow the BODMAS rule which states that we should calculate the Brackets first (2 + 4 = 6), then the Orders (52 = 25), then any Division or Multiplication (3 x 6 (the answer to the brackets) = 18), and finally any Addition or Subtraction (18 + 25 = 43).

Step-by-step explanation:

(5+4) × 5 + 3.3

Bracket open = 9

Since there is no division, so multiply 9×5, which is 45

Then add, 45+3.3

Answer= 48.3

7 0

3 years ago

Show me how to solve please. thanks (-:

Alex73 [517]

M<1+ m<2 = 90
-2x + 54 + 8x + 18 = 90
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6x = 18
x = 3

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3 years ago

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If his heartbeat has increased by 8 beats per minute after 20 minutes of working out how much will his heartbeat have increased

-BARSIC- [3]

Answer:

12 beats per minute after 30minutes

Step-by-step explanation:

Since we are told by how much his heartrate increased in 20 minutes, we can simply calculate how much it increased in 10 minutes and add that amount to the current heart rate to know how much his heartrate increased after 30 minutes of working out. Since 10minutes would be half of the 20minutes we simply divide the beats per minute by 2.

8 / 2 = 4 beats per minute after 10 minutes

Now we simply add this to the beats per minute at the 20minute mark to calculate the beats per minute at 30minutes

8 + 4 = 12 beats per minute after 30minutes

3 0

3 years ago

Find the volume of a square pyramid with a base area of 18 in.² and a height of 6 in

Ludmilka [50]

ANSWER

36 cubic inches.

EXPLANATION

The volume of a square pyramid is calculated using the formula:

$V = \frac{1}{3} {l}^{2} \times h$

where l² is the area of the base and h= 6 inches is the height of the square pyramid.

We substitute the values into the formula to get,

$V = \frac{1}{3} \times 18 \times 6 \: {in}^{3}$

We simplify to get:

$V = 6 \times 6 =3 6 {in}^{3}$

Therefore the volume of the square pyramid is 36 cubic inches.

6 0

4 years ago