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2 years ago

HELP ME PLEASE ASAPPPPPP ASAPPP

Mathematics

1 answer:

Lady bird [3.3K]2 years ago

6 0

Answer:

65.63 cm or 65 5/8 cm

Step-by-step explanation:

volume of a rectangular prism = whl

w= 7 1/2

h = 2 1/2

l = 3 1/2

w x h x l

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What is the approximate area of a regular pentagon with a side length of 6 feet and a distance from the center to a vertex of 6

Sergio [31]

The answer is 7,776.

6 0

3 years ago

Read 2 more answers

-7x-27=8-1(x-19) show how to get this

Nadya [2.5K]

$-7x-27=8-1(x-19) \\
-7x-27=8-x+19\\
-6x=54\\
x=-9$

3 0

3 years ago

What is 11.52/128 show your work

grandymaker [24]

Answer:

The answer is

Step-by-step explanation:

11.5/128

First convert the decimal to an improper fraction

That's

$11.52 = \frac{288}{25}$

So we have

$\frac{288}{25} \div 128$

Change the division sign to multiplication sign and reverse the second number

That's

$\frac{288}{25} \times \frac{1}{128}$

Simplify

$\frac{288}{3200}$

Divide through by 32

The final answer is

$\frac{9}{100}$

Hope this helps you

6 0

3 years ago

U = 6i – 10j<br> g= -81 – 11j<br> Find: -3u + 5g

VARVARA [1.3K]

Answer:

$-3u + 5g =-58i -25j$

Step-by-step explanation:

Given

$u = 6i - 10j$

$g=-8i - 11j$

Required

$-3u + 5g$

We have:

$-3u + 5g$

This gives:

$-3u + 5g = -3(6i - 10j) + 5(-8i - 11j)$

Open bracket

$-3u + 5g = -18i + 30j - 40i - 55j$

Collect like terms

$-3u + 5g = -18i - 40i+ 30j - 55j$

$-3u + 5g =-58i -25j$

6 0

2 years ago

A certain element has a half life of 2.5 billion years. a. You find a rock containing a mixture of the element and lead. You det

sashaice [31]

Answer:

Step-by-step explanation:

For a first order decay, fraction remaining = 0.5n where n = number of half lives elapsed.

fraction remaining = 55% = 0.55

0.55 = 0.5n

log 0.55 = n log 0.5

-0.2596 = -0.301 n

n = 0.8625 = # of half lives elapsed

0.8625 half lives x 2.5 billion years/half live = 2.16 billion years have elapsed = age of the rock

b) 0.15 = 0.5n

log 0.15 = n log 0.5

-0.824 = -0.301 n

n = 2.74 half lives

2.5 billion years/half life x 2.74 half lives = 6.85 billion years = age of rock

7 0

3 years ago