Select all that apply. Any element can always be identified by its:

atomic mass

number of neutrons

number of protons

atomic number

Answers

Answer 1

Answer: I Think it is atomic mass

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What is the measure of the vertex angle in the next triangle in the pattern?4 isosceles triangles in a row, each smaller than the one before. The first has base angles 89 degrees and vertex angle 2 degrees, the second has base angles 88 degrees and vertex angle 4 degrees, the third has base angles 87 degrees and vertex angle 6 degrees, and the fourth has base angles 86 degrees and vertex angle 8 degrees,

Not to scale

vertex angle =

Answers

Answer:

The measure of the vertex angle of the next isosceles triangle is 10°

Step-by-step explanation:

The given information are;

The first isosceles triangle; Base angles = 89°, vertex angle = 2°

The second isosceles triangle; Base angles = 88°, vertex angle = 4°

The third isosceles triangle; Base angles = 87°, vertex angle = 6°

The fourth isosceles triangle; Base angles = 86°, vertex angle = 8°

The vertices of the isosceles triangles form a arithmetic projection, with a common difference of 2°

Therefore, the vertex for next isosceles triangle = 8° + 2° = 10°

The base angles are derived from the sum of interior angles of a triangle which is 180°

Which gives;

2 × Base angles + Vertex angle = 180°

2 × Base angles + 10° = 180°

2 × Base angles = 180° - 10° = 170°

Base angles = 170°/2 = 85°

Base angles of the fifth isosceles triangle = 85°

From which we have;

The fifth isosceles triangle; Base angles = 85°, vertex angle = 10°

The measure of the vertex angle of the next (fifth) isosceles triangle = 10°

Since the creation of a social program, the percent of persons 65 years and over with a family income below the poverty level has declined. The percent can be approximated by the function P(t)=30.71-5.77ln t, where t is the number of years since 1965. Find the percent of persons 65 & over with family income below the poverty level and the rate of change in 1970.

i know how to find the percent, but don't know how to find the rate of change. Please help!

Answers

actually rate means anything divided by time......hope it helps

I need help to graphs these problem please

Answers

If you're talking about #5, where you have to graph the equation . . .

All you have to do is find two points on the graph, and draw a line between them.

How do you find points ? That's where you are in control !
Just pick any number you like for 'x', and then use the equation
to calculate the 'y' that goes with it.

Examples:

Pick 'zero' for 'x'.
Y = (1/2)x + 3
Y = 3

Pick 10 for 'x'.
y = (1/2)x + 3
y = 5 + 3
y = 8

Just create two points that way, using the equation. Then mark
the two points on the graph, and draw a line through the two points.

Multiply. - 4.3 x - 3.2 =

Answers

Negative x negative gives you a positive number, so just multiply the two numbers and leave your result as a positive...

-4.3 x -3.2 = 13.76

Express 0.00419 in standard form

Answers

the standard form is 4.19•10^-3

Juan earns 52 dollars per weekworking part-time at a book store.
He makes one dollar more for each
book that he sells. The amount, A
(in dollars), that Juan
earns in a week if he sells b books
is given by the following.

A=52 + b

How much does Juan earn in a
week if he sells 37 books?