A new pencil weighs 25 grams. After the pencil has been used for a while, it weighs 2 decagrams. How many grams of the pencil have been used up

Answers

Answer 1

Answer: 5 grams of the pencil have been used up.

Answer 2

Answer: 5 grams have been used up.

2 decagrams = 20 grams

You originated with 25.

25 - 5 = 20

Therefore the answer is 5 grams.

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Please someone help me i do not know the answer

Answers

Answer:

For #9, the part of the expression that represents the quotient is the division problem in parenthesis. Specifically, "(45 ÷ 9)". I believe you only need the division symbol for this, though. Correct me if I'm wrong.

As for #10, the part of the expression representing the product of two factors is 5.2 being multiplied by the variable $u$ . This results in the the term $5.2u$ , with the coefficient being 5.2 and the variable being $u$ .

Her investment grew 22% to$610 how much did she invest____ ( solve as an equation or fraction)

Answers

x + 0.22x = 610
1.22x = 610
x = 500

$500

how much would $120 invested at 6% interest compounded monthly be worth after 21 years? round to the nearest cent

Answers

The formula is
A=p (1+r/k)^kt
A future value?
P present value 120
R interest rate 0.06
K compounded monthly 12
T time 21 years
A=120×(1+0.06÷12)^(12×21)
A=421.72

Hope it helps!

Physics students drop a ball from the top of a 100 foot high building and model its height as a function time with the equation h(t) = 100 - 16t^2. Determine, to the nearest tenth of a second, when the ball hits the ground.