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2 years ago

8

Students in a class have to choose 4 out of 7 people who were nominated for the student council. How many different groups of st

udents could be selected?

1 answer:

Lady_Fox [76]2 years ago

3 0

Answer:

35

Step-by-step explanation:

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What is 1/4 + 1/2 ?

iren [92.7K]

Answer:3/4=0.75

Step-by-step explanation:

First, 1/2=2/4

Therefore: 1/4+2/4=3/4=0.75

8 0

3 years ago

Read 2 more answers

A carpenter wants to build a rectangular box with square sides in which to put round things. the material for the bottom costs $

alexira [117]

Answer: $1.627\times 1.627\times 1.88\ ft^3$

Step-by-step explanation:

Given

Suppose side face have a dimension of l\times l

and width of h

volume $V=l^2\cdot h$

$h=\frac{V}{l^2}$

volume $V=5 ft^3$

Area of side wall is $A_s=l^2$

Area of top Wall $A_t=l\times h$

Area of bottom $A_b=l\times h$

Cost of bottom wall $c_b=20\times l\times h=20lh$

Cost of top wall $c_t=50\times l\times h=50lh$

Cost of side walls $c_s=4\times l^2\times 10=40l^2$

total cost $C=c_s+c_t+c_b=20lh+50lh+40l^2$

$C=70lh+40l^2$

$C=70\times l\times \frac{5}{l^2}+40l^2$

differentiate C w.r.t l to get minima or maxima

$\frac{\mathrm{d} C}{\mathrm{d} l}=0$

$-\frac{350}{l}+80l^2=0$

$l^3=\frac{350}{80}$

$l=1.627 ft$

$h=\frac{5}{2.648}$

$h=1.88 ft$

Dimension of Box is $1.627\times 1.627\times 1.88\ ft^3$

5 0

2 years ago

Billy had 55 stamps in his collection. Billy’s older brother Tommy had 73 stamps in his collection. How many stamps did the two

KengaRu [80]

Answer:

128

Step-by-step explanation:

Billy has 55 stamps and his brother Tommy has 73. Add 73 and 55 together. 55+73=128

6 0

1 year ago

Write two prime numbers whose difference is 10?

bagirrra123 [75]

23-13=10

Prime numbers : A whole number greater than 1 that can not be made by multiplying other whole numbers Prime numbers between 1 to 100 : 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97 So, The two numbers whose difference is 10 are 13 and 23 23-13=10

3 0

2 years ago

Sara says, "If you subtract 19 from my number and multiply the difference by - 6, the result is - 72." What is Sara's number?

deff fn [24]

19-7 equals 12. 12 times -6=-72. Sara’s number is 7

4 0

2 years ago

Read 2 more answers