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Talja [164]
3 years ago
12

Can someone quickly answer this please

Mathematics
1 answer:
AnnyKZ [126]3 years ago
8 0

Answer:

Step-by-step explanation:

Hello !

(4,4*2,4) + (3,14 * 2,2² )/2 =

10,56 + 7,60 = 18,2 m²

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Marcie solved the following inequality and her work is shown below:. . −2(x − 5) − 12 ≤ 4 + 6(x + 3). −2x + 10 − 12 ≤ 4 + 6x + 1
BartSMP [9]

All steps that Marcie did are right, but she forgot to change sign in last step.

Consider the inequality

-2(x - 5) -12 \le 4 + 6(x + 3).

Then

-2x+10-12 \le 4 + 6x+18.

Group the numbers:

-2x-2 \le 6x+22.

Separate terms with x and without x in different sides:

-2x-6x \le 22+2.\\-8x\le 24.

The coefficient at x is -8 and it is negative, then dividing the inequality by -8 you have to change sign in opposite:

x\ge -3.

Answer: Marcie forgot to change sign in last step.

3 0
3 years ago
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Explain why cos(x)=sin(90-x) for x such that 0
aleksley [76]
Use the sin(a - b) formula. 
<span>sin(90 - x) = </span>
<span>sin90 cosx - cos90 sinx = </span>
<span>1 cosx - 0 sinx = </span>
cosx
8 0
3 years ago
Casandra finds a treasure chest packed with metallic coins. The chest has a volume of 0.25^30.25 m
Vladimir [108]

Answer:

Gold

Step-by-step explanation:

<em>Casandra finds a treasure chest packed with metallic coins. The chest has a volume of 0.25 cubic meters. The coins have a combined mass of 4825 kg. Hoping to find gold, she calculates the density to determine the metal of the coins.</em>

<em>What kind of metal are the coins made of?</em>

<em>Bronze (8700 kg per cubic meter)</em>

<em>Silver (10500 kg per cubic meter)</em>

<em>Lead (11300 kg per cubic meter)</em>

<em>Gold (19300 kg per cubic meter)</em>

<em />

Density is mass per volume:

D = M / V

D = (4825 kg) / (0.25 m³)

D = 19,300 kg/m³

The coins must be made of gold.

4 0
3 years ago
Help plz and it’s not 61.6 because that’s what someone has said
bekas [8.4K]

Answer:  250 total kids and 140 girls

Step-by-step explanation:

%56=girls that means %44= boys  that means 110 is %44 of the number of kids is 110/44*100= 2.5*100=250kids  56%=girls that means %56 of 250 which is 140 girls

7 0
3 years ago
Mars has m moons. The number of moons of Pluto is one more than twice the number of moons of Mars. The number of moons of Neptun
tigry1 [53]

Answer:

Neptune has 2 more than 6 times the number of moons on mars

Explanation:

neptune = 6m+2

mars has 'm' moons

pluto has one more than twice that of mars, = 2m+1

neptune is one less than thrice of pluto

= 3(2m+1) -1

= 6m+3 -1

= 6m+2

6 0
2 years ago
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