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3 years ago

Can anyone help me plz

Mathematics

1 answer:

mario62 [17]3 years ago

4 0

Answer:

Step-by-step explanation:

The answer is four because 10% of the whole tray (40) is 4

Equation:

.1 * 40 = 4

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A person has a bag containing quarters and dimes. There are a total of 72 coins in the bag, and the total value of the coins is

ipn [44]

Answer:

40 quarters and 32 dimes

Step-by-step explanation:

Given:

Quarter = 25 ¢, number of quarters = q
Dime = 10 ¢, number of dimes = d
Total amount = $13.20 = 1320 ¢

Required equations:

q + d = 72
25q + 10d = 1320

Solve by elimination, multiply the first equation by 10 and subtract from the second equation:

25q + 10d - 10q - 10d = 1320 - 10*72
15q = 600
q = 600/15
q = 40

Find p:

40 + p = 72
p = 72 - 40
p = 32

6 0

3 years ago

At the moment a hot cake is put in a cooler, the difference between the cake's and the cooler's temperatures is 50\degree50°50,

lozanna [386]

Answer:

$D(t)=50^o(0.80)^t$

Step-by-step explanation:

The correct question is

At the moment a hot cake is put in a cooler, the difference between the cake's and the cooler's temperatures is 50 degree Celsius. This causes the cake to cool and the temperature difference loses 1/5 of its value every minute.

Write a function that gives the temperature difference in degrees Celsius, D(t), t minutes after the cake was put in the cooler

we know that

The equation of a exponential decay function is equal to

$D(t)=a(1-r)^t$

where

D(t) is the temperature difference in degrees

t is the number of minutes

r is the rate of change

a is the initial value

we have

$a=50^oC$

$r=\frac{1}{5}=0.20$

substitute

$D(t)=50^o(1-0.20)^t$

$D(t)=50^o(0.80)^t$

4 0

3 years ago

Read 2 more answers

What is the reference angle of 12.9?

stiks02 [169]

Answer:

dty

Step-by-step explanation:

6 0

4 years ago

Which expressions below are equivalent to –3(0.15 – 0.2 + 0.25p) ? Please help, thanks 0.15 – 0.75p –0.45 – 0.6 + 0.75p –3(–0.05

user100 [1]

Given:

The expression is

$-3(0.15-0.2+0.25p)$

To find:

The equivalent expression.

Solution:

We have,

$-3(0.15-0.2+0.25p)$

It can be written as

$=-3(-0.05+0.25p)$

So, option C is correct.

$=-3(-0.05)+(-3)(0.25p)$

$=0.15-0.75p$

So, option A is correct.

The given expression can be written as

$=-3(0.15)+(-3)(-0.2)+(-3)(0.25p)$

So, option D is incorrect.

$=-0.45+0.6-0.75p$

So, option B is incorrect.

Therefore, the correct options are A and C.

4 0

3 years ago

What does 9 ×9÷6-3 equal

Mkey [24]

Answer:

It equals 10.5

Step-by-step explanation:

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3 years ago

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