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3 years ago

John's Mathematics exam mark this year is increased by 5% to 84. Find his Mathematics exam mark

Mathematics

2 answers:

Svet_ta [14]3 years ago

8 0

Answer:

80%

Step-by-step explanation:

Let's call the past exam mark m,

m*105%=84

m*105/100=84

m=84/(105/100)

m=80

Hope this helps!

nadya68 [22]3 years ago

3 0

Answer:

Step-by-step explanation:

new value = 84

old value = n

can use percent change formula: (new value - old value) / old value = 5/100

$\frac{84-n}{n}$ = $\frac{5}{100}$

cross-multiply (you can simplify 5/100 to be 1/20 first): 20(84 - n) = n

1680 - 20n = n

1680 = 21n

n = 80

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postnew [5]

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4 years ago

The circle below has center C, and its radius is 4 feet. Find the area of the sector with central angle DCE given

garik1379 [7]

Answer:

$area = \frac{8}{3}pie ft^2$

Step-by-step explanation:

Area of sector is given as θ/360*πr²

Where,

θ = central angel of sector, m < DCE = 60°

r = radius = 4 feet

Area of sector = $\frac{60}{360}*pie*4^2$

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3 years ago

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charle [14.2K]

Answer:

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Step-by-step explanation:

7 0

4 years ago

A tree is 4<br> is 4.4 feet tall. It is expected to grow by 1 feet per year.

LekaFEV [45]

Answer:

it should be 10.4 in 6 years.

Step-by-step explanation:

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3 years ago

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Sladkaya [172]

Answer:

19.5/20

Step-by-step explanation:

3/4=15/20

6/5=24/20

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3 years ago