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Ronch [10]
3 years ago
14

Every kid in Mr. Levans's 3rd grade class made a valentine for every kid in the class, including themselves. If the class made a

total of 484 valentines, how many kids are in the class?
Mathematics
2 answers:
Yanka [14]3 years ago
6 0

Answer:

The answer is 22

Step-by-step explanation:

pshichka [43]3 years ago
3 0

Answer:

There are 56 students in the class

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a rectangle has a width that is 7 centimeters less than its length, and it’s area is 330 square centimeters. what are the dimens
WINSTONCH [101]

Answer:

The dimensions of the rectangle are 22cm of length and 15cm of width

Step-by-step explanation:

To solve this we first have to know the formula to calculate the area of ​​a rectangle

a = area = 330 cm²

L = length  =

w = width = L - 7cm

a = l * w

we replace with the known values

330 cm² = L * (l - 7cm)

330 cm² = L² - 7Lcm

0 = L² - 7Lcm - 330 cm²

when we have an equation like this we can use bhaskara

a = 1

b = -7Lcm

c = -330cm²

ax² + bx + c = 0

x = -b(±)√(b² - 4ac)/2a

we replace with the known values

L = -(-7cm)(±)√(7² - 4(1)(-330cm²)) / 2(1)

L = 7cm(±)√(49 + 1320cm²)) / 2

L = 7cm(±)√(1369cm²)) / 2

L1 = (7cm + 37cm) / 2

L1 = 44cm / 2 = 22cm

L2 = (7cm - 37cm) / 2

L2 = -30cm / 2 = -15cm

The positive represents the unknown with which we work (L) and the negative with which we do not work (W)

The dimensions of the rectangle are 22cm of length and 15cm of width

6 0
3 years ago
Plz answer and im giving a lot of points ; ; oh and its two questions in one
Natali [406]
Please don't ask 2 questions in 1 question



remember that percent is parts out of 100 so x%=x/100
basically just remove the percent sign and move the decimal place 2 places to the left  to convert to fraction

the first one
20 dollars
4.75% tax
15% tip
it depends if you want to tip on the total with tax or without tax
it is better to top on the without-tax value since tax comes from you so
find 4.75% of 20 and add that to 15% of 20 then add that to 20 to get the proper value

scenarios
1. 20+(20 times 4.75%)+(20 times 15%)=23.95
2. ([(20 times 104.75%)] times 115%)=24.09
both are bellow $25 so $25 shoudl be enough to cover it




total cost of a spa treatment of 42 with 6% tax and 20% tip
so you could again do two things:
1. apply tax and give tip on the new amount
2. find the tip and add that to the tax of only 42

scenarios:
1.(42 times 106%) times 120%=$50.4
2. (42 times 20%) +(42 times 106%)=$52.92
it depens on what you tip on
6 0
3 years ago
What is the surface area of the pyramid?
Leviafan [203]

Answer:

40

Step-by-step explanation:

Find the area of each side and add them together. The area of triangles equals Height time 1/2base so you get a=1/2(4)(3). A=6. 6+6+6+6=24 plus the base which is 4x4=16. 26+16=40

40 is our final answer

5 0
3 years ago
Read 2 more answers
A six-sided die is rolled eleven times. What is the probability that the die will show an even number exactly nine times?
Black_prince [1.1K]

Answer:

It is D

Step-by-step explanation:

6 x 11 = 66

3 x 9 = 27

4 0
3 years ago
Area of hexagon please help
podryga [215]

\frac{ 3\sqrt{3} }{2}  \times a {}^{2}  \\  \\   \frac{ \sqrt{27} }{2} \times 7 {}^{2}  \\  \\ \frac{ \sqrt{27} }{2} \times 49 \\  \\  = 127.31cm {}^{2}

<h3>So Option D=127.3cm²</h3>

<h3>Hope This Helps You </h3>

3 0
3 years ago
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