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3 years ago

Help me please please!!

Mathematics

1 answer:

Svetradugi [14.3K]3 years ago

7 0

Answer: Robert put 5 * (8) * 2 instead of putting 5 * (-8) * 2

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Thomas collects dimes and quarters in his change jar. If he has 7 more dimes than quarters, and the total amount of money in the

natali 33 [55]

Answer:

76 quarters and 83 dimes

Step-by-step explanation:

From the information given, you can write the following equations considering that a quarter represents $0.25 and a dime $0.10:

y=x+7 (1)

0.25x+0.10y=27.30 (2)

x is the number of quarters

y is the number of dimes

Now, you can replace (1) in (2):

0.25x+0.10(x+7)=27.30

0.25x+0.10x+0.7=27.30

0.35x=27.30-0.7

0.35x=26.6

x=26.6/0.35

x=76

Then, you can replace the value of x in (1) to find the value of y:

y=76+7

y=83

According to this, the answer is that there are 76 quarters and 83 dimes in the jar.

6 0

4 years ago

The circumference of a circle can be found using the c = 2πr Find the circumference of a circle with a diaper of 4 ft

Virty [35]

Answer:

12.57

Step-by-step explanation:

2 π r d= 2 r

Solving for C

C= d = π 4 ≈12.56637

3 0

3 years ago

Molly walked 3.45 miles on a hike. her sister walked 1.23 miles. her brother walked 0.85 miles. how much farther did molly walk

Oxana [17]

The answer is B......

5 0

3 years ago

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The radius of a right circular cone is increasing at a rate of 1.1 in/s while its height is decreasing at a rate of 2.6 in/s. At

o-na [289]

Answer:

The volume of the cone is increasing at a rate of 1926 cubic inches per second.

Step-by-step explanation:

Volume of a right circular cone:

The volume of a right circular cone, with radius r and height h, is given by the following formula:

$V = \frac{1}{3} \pi r^2h$

Implicit derivation:

To solve this question, we have to apply implicit derivation, derivating the variables V, r and h with regard to t. So

$\frac{dV}{dt} = \frac{1}{3}\left(2rh\frac{dr}{dt} + r^2\frac{dh}{dt}\right)$

Radius is 107 in. and the height is 151 in.

This means that $r = 107, h = 151$

The radius of a right circular cone is increasing at a rate of 1.1 in/s while its height is decreasing at a rate of 2.6 in/s.

This means that $\frac{dr}{dt} = 1.1, \frac{dh}{dt} = -2.6$

At what rate is the volume of the cone changing when the radius is 107 in. and the height is 151 in.

This is $\frac{dV}{dt}$ . So

$\frac{dV}{dt} = \frac{1}{3}\left(2rh\frac{dr}{dt} + r^2\frac{dh}{dt}\right)$

$\frac{dV}{dt} = \frac{1}{3}(2(107)(151)(1.1) + (107)^2(-2.6))$

$\frac{dV}{dt} = \frac{2(107)(151)(1.1) - (107)^2(2.6)}{3}$

$\frac{dV}{dt} = 1926$

Positive, so increasing.

The volume of the cone is increasing at a rate of 1926 cubic inches per second.

8 0

3 years ago

0.4 / 1.28 can you please help me with this math problem

Ann [662]

Answer:

0.3125

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers