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2 years ago

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PLEASE HELP Evaluate 2^-4

2 answers:

Advocard [28]2 years ago

8 0

Negative exponent means we have to invert the fraction.

So:

$2^{-4}$

$\frac{1}{2^4}$

$\frac{1}{2.2.2.2}$

$\frac{1}{16}$

Alternative: C.

Setler [38]2 years ago

7 0

Answer: option c is correct. 1/16

Step-by-step explanation:

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What expression best estimates -18 1/4 ÷ 2 2/3<br>a. 18÷3<br>b. -18÷3<br>c. -18÷(-3)<br>d. 18÷(-3)

agasfer [191]

B) because if you round your numbers, -18 1/4 is -18 and 2 2/3 rounds up to positive 3

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Rob can mop a warehouse in 10 hours. Maria can mop the same warehouse in 11 hours. Find how long it would take them if they work

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2 years ago

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What is the sum of series is numbers 64&66 ?<br> Using the summation notation

iragen [17]

Answer:

64. 6138

66. 8.078125

Step-by-step explanation:

Let's take it one number at a time.

For number 64:

$6(2)^{1-1}=6$

$6(2)^{2-1}=12$

$6(2)^{3-1}=24$

$6(2)^{4-1}=48$

$6(2)^{5-1}=96$

$6(2)^{6-1}=192$

$6(2)^{7-1}=384$

$6(2)^{8-1}=768$

$6(2)^{9-1}=1536$

$6(2)^{10-1}=3072$

Sum = 6 + 12 + 24 + 48 + 96 + 192 + 384 + 768 + 1536 + 3072

Sum = 6138

For number 66:

$12(-\frac{1}{2})^{0}=12$

$12(-\frac{1}{2})^{1}=-6$

$12(-\frac{1}{2})^{2}=3$

$12(-\frac{1}{2})^{3}=-1.5$

$12(-\frac{1}{2})^{4}=0.75$

$12(-\frac{1}{2})^{5}=-0.375$

$12(-\frac{1}{2})^{6}=0.1875$

$12(-\frac{1}{2})^{7}=-0.0078125$

$12(-\frac{1}{2})^{8}=0.046875$

$12(-\frac{1}{2})^{9}=-0.0234375$

Sum = 12 + -6 + 3 + -1.5 + 0.75 + -0.375 + 0.1875 + -0.0078125 + 0.046875 + -0.0234375

or to make things simpler:

Sum = 12 - 6 + 3 - 1.5 + 0.75 - 0.375 + 0.1875 - 0.0078125 + 0.046875 - 0.0234375

Sum = 8.078125

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2 years ago

Help answer please! math question

sweet-ann [11.9K]

Answer:

he will use 2 posts.

Step-by-step explanation:

the two posts together will make 1 foot, so with one post on each endof the 7 foot deck, that leaves 6 feet between them.

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Korolek [52]

Answer:

B

Step-by-step explanation:

10×1=10

0+10=10

Hence they're equal

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2 years ago