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3 years ago

PLS HELP LAST THING I NEED FOR MATH THIS SCHOOL YEAR

Mathematics

1 answer:

katrin [286]3 years ago

8 0

Answer:

B = 25 because 180-25-130 = 25 and all angles within triangle add to 180 degrees

a = 6 because the triangle is isosceles and we can see symmetry and draw this to prove on two opposite lines, therefore we can now find height easier.

c = 10. 876 because 130/2 = 65 degree and with new central height we can find Right Angle and using 6 x sin (65) = 5. 438 then we multiply by 2 to find c

Then all you have to do is re-write and round to the nearest 10th and check the units and write degree sign where required.

Step-by-step explanation:

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There are 15 boys and 5 girls in a class.

Ipatiy [6.2K]

Answer: 50.0

Step-by-step explanation:

1. Add 45+55=100

2. Divide 100 by 2 =50

3. Add a decimal after 50.0

7 0

3 years ago

if syn spends 15 minutes running, he burns 200 calories. how long would it take Syn to burn 150 calories?

kramer

Answer:

Step-by-step explanation:

In this problem, we first need to find the rate at which syn burns calories per minute

so in 15mins, he burns 200 calories

in 1 mins he will burn x

x= 200/15

x=13.33 calories per min this is the rate

So in one minute he will burn 13.33 calories

Now using the idea of rate=quantity/time

the rate=13.33

quantity=15 calories

time=?

time=quantity/rate

time=150/13.33

time=11.25min

Alternatively

(very fast approach)

if syn spend 15min to burn 200 cal

then he will spend x min to burn 150 cal

cross multiply

x=(150*15)/200

x=2250/200

x=11.25mins

5 0

3 years ago

A company wishes to manufacture a box with a volume of 2424 cubic feet that is open on top and is twice as long as it is wide. f

olganol [36]

<span> Let x = the width
Let 2x = the length
Let h = the height
</span>then vol = x*2x*h. So we have 2x^2*h = 24
h=24/(2*x^2)=12/x^2
Surface area: two ends + 1 bottom + 2 sides (no top)
S.A. = 2(x*h) + 1(2x*x) + 2(2x*h)
S.A. = 2xh + 2x^2 + 4xh<span> S.A. = 2x^2 + 6xh
</span>Replace h with 12/x^2
S.A = 2x^2 + 6x(12/x^2)
S.A = 2x^2 + 6(12/x)
S.A = 2x^2 + (72/x)
Graph this equation to find the value of x for minimum material
Min surface area when x = 3.0 is the width<span> then
</span>2(3) = 6 is the length
Find the height:
h=12/(3.0)^2
h=1.33
Box dimensions for min surface area: 3.0 by 6 by 1.33; much better numbers
Check the vol of these dimensions: 3.0*6*1.33 ~ 24
graphic attachment

3 0

3 years ago

A retailer buys pairs of shoes for $45.50 each. He marks up all his merchandise 25%. How much will he sell the shoes for? (Round

Zielflug [23.3K]

Answer:

56.88

Step-by-step explanation:

2 ways to do this

45.50 x 25% = 11.375

45.50 + 11.375 = 56.875

and that rounds to 56.88

for option 2 I recommend a calculater

45.50 + 25% = 56.875

56.88

8 0

4 years ago

The Jones family was one of the first to come to the U.S. They had 9 children. Assuming that the

zubka84 [21]

Answer:

At least 7 girls: 0.5^7 OR 0.0078125

At least 8 girls: 0.5^8 OR 0.00390625

5 0

3 years ago