3 years ago

HELP ON A TEST Factor the expression: 4x^2 - 121 (x^2 means x squared)

Mathematics

1 answer:

GenaCL600 [577]3 years ago

8 0

(2x-11)(2x+11) is the answer

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topjm [15]

(-1,2.5), (0,5), (1,10), (2,20)

5 0

3 years ago

In a certain country the life expectancy for women in 1990 was 45 and in 2000 it was 85?years. Assuming that life expectancy bet

Darya [45]

Answer:

49145 years

Step-by-step explanation:

In a certain country the life expectancy for women in 1990 was 45 and in 2000 it was 85?years.

Assuming that life expectancy between 2000 and 2100 increases by the same percentage as it did between 1900 and 2000,what will life expectancy be for women in 2100?

In 10 years, the expectancy increased by 85/45 = 17/9

between 2000 and 2100, it will increas by 10 time 10 years, so expected expectancy is $85*(\frac{85}{45})^{10} = 49145$ years

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3 years ago

The decay of 192 mg of an isotope is given by A(t)= 192e-0.015t, where t is time in years. Find the amount left after 55 years.R

finlep [7]

This is a typical radioactive decay problem which uses the general form:

A = A0e^(-kt)

So, in the given equation, A0 = 192 and k = 0.015. We are to find the amount of substance left after t = 55 years. That would be represented by A. The solution is as follows:

A = 192e^(-0.015*55)
<em>A = 84 mg</em>

6 0

4 years ago

Among the 1018 respondents, 179 said that cellular phones are “not at all annoying”.

Grace [21]

179/1018=.17580
.17580*100=17.6%

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4 years ago

What is z + 15=27 subject is math and the assignment is named Solving 1 Step Equations using Addition and Subtraction I need hel

Gemiola [76]

Answer:

z=12

Step-by-step explanation:

z+15=27

move constant

z=27-15

z=12

4 0

3 years ago