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2 years ago

Questions attached below

Mathematics

1 answer:

Cerrena [4.2K]2 years ago

8 0

Step-by-step explanation:

1 ) 1/2×4×8

=16

2) 1/2 ×7×6

=21

3)1/2×14×36

=252

4)1/2×25×54

675

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. You want to buy a book worth Php 220.50. You can buy it only by making a sacrifice of not buying a soft drink every day. If so

kherson [118]

Answer:

B-14

Step-by-step explanation:

Divide 220.50 by 15.75 and you will get 14

Hope it can help you lovelots

4 0

2 years ago

Read 2 more answers

Let A(t) be the area of a circle with radius r(t), at time t in min. Suppose the radius is changing at the rate of drdt=6 ft/min

mylen [45]

Answer:

The rate of change is $108\pi$ ft^(2)/min

Step-by-step explanation:

The area of a circle is given by the following equation:

$A(t) = \pi r^{2}$

To solve this question, we have to realize the implicit differentiation in function of t. We have two variables, A and r. So

$\frac{dA(t)}{dt} = 2\pi r \frac{dr}{dt}$

We have that:

$\frac{dr}{dt} = 6, r = 9$ .

We want to find $\frac{dA}{dt}$

$\frac{dA(t)}{dt} = 2\pi*9*6$

$\frac{dA}{dt} = 108\pi$

Since the area is in square feet, the rate of change is in ft^(2)/min.

So the rate of change is $108\pi$ ft^(2)/min

5 0

2 years ago

One gallon of paint covers 400 square feet of surface area. A typical spherical water tower holds 66,840.28 cubic feet of water.

fredd [130]

Answer:

They would need approximately 20 gallons of paint for the water tower, so yes, 25 gallons would be enough.

Step-by-step explanation:

In order to find out if there is enough paint for the surface area of the sphere, you need to first find the radius of the object so you can determine the measure of the entire surface area. Since they give us the volume, we can use that to solve for the radius using the volume formula: V = πr³ or 66840.28 = πr³. Using inverse operations, you can first multiply both sides of the equation by the reciprocal of 4/3 or 3/4, then divide by π, this gives you 15,965 = r³. In order to find 'r', take the cube root of both sides: ∛15965 = ∛r³ or r ≈ 25.

Now that you know radius = 25, you can use the formula for surface area: SA = 4πr² or 4π(25)² ≈ 7850 ft². Since one gallon of paint covers 400 square feet, we can take our total and divide by 400 to find the number of gallons: 7850 ÷ 400 ≈ 19.6. In total, we would need 19.6 gallons of paint for the water tower, so if there are 25 gallons available, there is enough.

3 0

2 years ago

A grocery store owner budgets $5,000 to buy and maintain a booth for 300 days to give out samples of food. If she bought the boo

serious [3.7K]

Answer:

x ≤ $12 a day

Step-by-step explanation:

5000-1400=3600

3600/300=12

7 0

2 years ago

Henry sells rings for $8 dollars each his expenses are $1.50 per ring plus $91 for supplies how many rings does he need to sell

Ne4ueva [31]

Henry needs to sale 14 rings for his revenue to equal his expenses.

Step-by-step explanation:

Given,

Selling price of ring = $8

Expense on one ring = $1.50

Cost of supplies = $91

Let,

x represent the number of rings.

Expenses = 91+1.50x

Revenue = 8x

Equal expenses means;

Revenue = Expenses

$8x=91+1.50x\\8x-1.50x=91\\6.5x=91$

Dividing both sides by 6.5

$\frac{6.5x}{6.5}=\frac{91}{6.5}\\x=14$

Henry needs to sale 14 rings for his revenue to equal his expenses.

Keywords: revenue, division

Learn more about division at:

#LearnwithBrainly

4 0

2 years ago

Questions attached below​

Questions attached below