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3 years ago

You have a grade of 85 & 90

Mathematics

2 answers:

faltersainse [42]3 years ago

7 0

Answer:

You need to get a 95 on the next test to have a 90 grade average.

Step-by-step explanation:

(85 + 90 + n)/3 = 90

Step 1: Multiply both sides by 3

(85 + 90 + n)/3 * 3 = 90 * 3

85 + 90 + n = 270

Step 2: Subtract 85 from both sides

85 + 90 + n - 85 = 270 - 85

90 + n - 90 = 185 - 90

n = 95

Answer: You need to get a 95 on the next test to have a 90 grade average.

pishuonlain [190]3 years ago

4 0

Answer:

Step-by-step explanation:

Average: 90

(85+90+X)/3 = 90

(175 + X) = 90×3

175 + X = 270

X = 95

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The length of a rectangle exceeds its breadth by 7cm. if the length is decreased by 4cm and the breadth is increased by 3cm, the

riadik2000 [5.3K]

Answer:

16cm

Step-by-step explanation:

Let the breadth = x

The length exceeds = x + 7

The breadth increased = x + 3

Because it said the length decreased by 4 so, the length would be:

x + 7 - 4 = x + 3

Original area:

We learn that:

area = length * breadth

x*(x+7) = (x+3)*(x+3)

x^2 + 7x = (x+3)^2

x^2 + 7x = x^2 + 6x + 9 (We also learn that (a+b)^2 = a^2 + 2ab + b^2

x^2 - x^2 + 7x - 6x = 9

x = 9 (so the breadth = 9)

The length = x + 7 = 9+7 = 16(cm)

Hope this help you :3

7 0

3 years ago

Find the area of the trapezoid A. 168 in^2 B. 94.5 ft^2 C. 72 ft^2 D. 84 ft^2

Rainbow [258]

Answer:

D. 84 ft^2

Step-by-step explanation:

Formula for area of a trapezoid:

$A=\frac{a+b}{2} h$

where a and b = bases and h = height

The trapezoid shown has the following dimensions

base 1 = 9ft

base 2 = 12ft

height = 8ft

Using the following information we plug in the values into the formula

$A=\frac{9+12}{2} \\9+12=21\\\frac{21}{2} =10.5\\10.5*8=84$

Hence, the area of the trapezoid is 84ft² and your answer is D

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2 years ago

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AnnyKZ [126]

Answer:

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Step-by-step explanation:

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3 years ago

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Answer:

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3 years ago

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Brut [27]

Answer:

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Step-by-step explanation:

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2 years ago

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