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3 years ago

2. Kelsea needs a test average of at least 90 to get an "A-" this marking period in math. Her three test grades

Mathematics

1 answer:

Luda [366]3 years ago

6 0

Answer:

Equation: 87 + 91 + 86 + x = 360

Solution: 264 + x = 360

x = 360 - 264

x = 96

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

First three Kelsea's test grades : 87, 91 and 86

2. What score must she get on her fourth test to receive at least an A- ?

Define variable: x that represents the grade needed by Kelsea on her fourth test to receive at least an A-

Equation: 87 + 91 + 86 + x = 360

Solution: 264 + x = 360

x = 360 - 264

x = 96

Now you can understand if the previous work you did is correct

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In a right angled triangke abc the perpendicular and the base measure 3 cm find hypotenus and three trignometrice ratios

Ierofanga [76]

Given:

In a right angled triangle ABC the perpendicular and the base measure 3 cm.

To find:

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Solution:

Pythagoras theorem:

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Use Pythagoras theorem in triangle ABC.

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$Hypotenuse^2=9+9$

$Hypotenuse=\sqrt{18}$

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The three trigonometric ratios are

$\sin \theta=\dfrac{Perpendicular}{Hypotenuse}$

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Similarly,

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$\cos \theta=\dfrac{1}{\sqrt{2}}$

And,

$\tan \theta=\dfrac{Perpendicular}{Base}$

$\tan \theta=\dfrac{3}{3}$

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Therefore, the hypotenuse is $3\sqrt{2}$ cm and three trigonometric ratios are $\sin \theta=\dfrac{1}{\sqrt{2}}, \cos \theta=\dfrac{1}{\sqrt{2}}, \tan \theta=1$ .

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