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Monica [59]
2 years ago
8

Evaluate 18 divided 2a if a = 3

Mathematics
1 answer:
Andreas93 [3]2 years ago
5 0

Answer:

3

Step-by-step explanation:

\frac{18}{2a}

a = 3

\frac{18}{2(3)}

multiply 2 and 3

2 * 3 = 6

\frac{18}{6}

simplify

18/6 = 3

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Find two geometric means between 5 and 135
aniked [119]
Answer:

We are effectively looking for a and b such that 5, a, b, 135 is a geometric sequence.

This sequence has common ratio <span><span>3<span>√<span>1355</span></span></span>=3</span>, hence <span>a=15</span> and <span>b=45</span>

Explanation:

In a geometric sequence, each intermediate term is the geometric mean of the term before it and the term after it.

So we want to find a and b such that 5, a, b, 135 is a geometric sequence.

If the common ratio is r then:

<span><span>a=5r</span><span>b=ar=5<span>r2</span></span><span>135=br=5<span>r3</span></span></span>

Hence <span><span>r3</span>=<span>1355</span>=27</span>, so <span>r=<span>3<span>√27</span></span>=3</span>

Then <span>a=5r=15</span> and <span>b=ar=15⋅3=45</span>


6 0
3 years ago
Find the roots of the following polynomial equations: 1. y = 2x2 + 3x - 5​
nydimaria [60]

Answer:

Step-by-step explanation:

y=2x^2+3x+5\\

Using the quadratic formula:

\frac{-3+-\sqrt{9-4(2)(5)}}{2(2)} = \frac{-3+-\sqrt{-31}}{4}

Since the discriminant is negative, -31, there are no real roots

3 0
3 years ago
Using the Following Image, solve for x
OlgaM077 [116]

Answer:

x = 2

Step-by-step explanation:

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x + 2 = 2x

2 = x

x = 2

5 0
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In a triangle ABC, the length of AB is 16 inches.
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