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g100num [7]
3 years ago
9

What is the answer for 2a x -a?

Mathematics
1 answer:
Verizon [17]3 years ago
6 0

Answer:

-2a²

Step-by-step explanation:

The question is  2a × -a

This means 2a(-a)

= -2×(a×a)

=-2(a²)

=-2a²

You might be interested in
Barbara made a bad investment. Rather than earning interest, her money is decreasing in value by 11% each week! After just one w
pochemuha

Answer: She started with $160.

It will take 6 weeks before she has less than half of what she originally invested.

Step-by-step explanation:

If her money is decreasing in value by 11% each week, it means that the rate at which it is decreasing is exponential.

We would apply the formula for exponential decay which is expressed as

A = P(1 - r)^t

Where

A represents the value of the investment after t weeks.

t represents the number of weeks.

P represents the initial value of the investment.

r represents rate of depreciation.

From the information given,

A = $142.40

r = 11% = 11/100 = 0.11

t = 1

Therefore

142.40 = P(1 - 0.11)^1

142.40 = P(0.89)

P = 142.4/0.89

P = 160

For her to have half of what she invested originally, then

80 = 160(0.89)^t

80/160 = (0.89)^t

0.5 = (0.89)^t

Taking log of both sides to base 10

Log 0.5 = log0.89^t = tlog0.89

- 0.3010 = - 0.051t

t = - 0.3010/- 0.051

t = 5.9

Approximately 6 weeks

5 0
3 years ago
How can division be represented by using a fraction?
IRINA_888 [86]
A fraction is just the easier, cleaner way of writing a division problem

the numerator is the number you are dividing

the denominator is the number you are dividing with

EX- 2 divided by 3 as a fraction is
2/3
8 0
3 years ago
What is the value of y?
RUDIKE [14]

Answer:

C. 55

Step-by-step explanation:

Since all angles in a triangle add up to 180°, we have:

40 + y + y + 30 = 180

2y + 70 = 180

2y = 110

y = 55

7 0
3 years ago
Read 2 more answers
How many solutions does the system of equations below have?<br> y = −6x + 9<br> y = 9/8x − 3
torisob [31]

Answer:

1 solution

Step-by-step explanation:

A system of two equations can be classified as follows:

1) If the slopes are the same but the y-intercepts are different, the system has no solution.

<em>2) If the slopes are different, the system has one solution.</em>

3) If the slopes are the same and the y-intercepts are the same, the system has infinitely many solutions

Hope this helps you

4 0
3 years ago
What’s half of 2 1/2 as a fraction?
aliina [53]

Answer:

5/4

Step-by-step explanation:

2 1/2=5/2

(5/2)(1/2)=5/4

8 0
3 years ago
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