MATHEMATICS MIDDLE SCHOOL

What is 0.4^-2 (0.4 to the power of -2)?

Answers

Answer 1
Answer: (4/10)^-2 = (2/5)^-2  = (5/2)^2 = 25/4 = 6.25
Answer 2
Answer:

Answer: 39.0625

Step-by-step explanation: (0.4^(-2))*(0.4^(-2))

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-3x^{2}-21x-54 what are the zeros? (Solutions)

Answers

the only way to solve if it is equal to something
assuming that the teacher wanted you to make it equal to zero do
0=-3x^2-21x-54

remember if we can do
xy=0 then assume x and y=0

so factor

0=-3x^2-21x-54
undistribute the -3
0=-3(x^2+7x+18)
remember 0 times anything=0 so
x^2+7x+18 must equal zero
use quadratice formula which is

if you have
ax^2+bx+c=0 then
x=\frac{-b+/- \sqrt{b^(2)-4ac} }{2a}

x^2+7x+18
a=1
b=7
c=18

x=\frac{-7+/- \sqrt{7^(2)-4(1)(18)} }{2(1)}
x=(-7+/- √(49-72) )/(2)
x=(-7+/- √(-23) )/(2)
i=√-1
x=(-7+/- i√(23) )/(2)



the zerose would be
x=(-7+ i√(23) )/(2) or (-7- i√(23) )/(2)

What's an integer for 300ft above sea level

Answers

Above is postive. So the answer is +300
since its above sea level its 300+

How to use a number line to add 235 +123

Answers

you count up to 235 which then gives you 358

Suppose two 1-6 number cubes are rolled. find the probability of each outcome. P(1 or 5)

Answers

Answer:

The probability of each outcome rolling two numbered cubes is 1/36 or 2.8% (Rounding to the next tenth)

Step-by-step explanation:

Probability of each outcome with one cube = Number of favorable events for each outcome/Total number of possible events

Replacing with the real values, we have:

Probability of each outcome with one cube = 1/6

Probability of each outcome with two cubes = 1/6 * 1/6 = 1/36

The probability of each outcome rolling two numbered cubes is 1/36 or 2.8% (Rounding to the next tenth)

a particular school has a teacher to a student ratio of a 1 teacher to 11 students. Are there more teachers or students explain how u know.

Answers

Read it carefully. It's telling you the answer in the problem! There is one teacher for every 11 students. Of course there are more students! 

An initial investment of $60.00 increases in value by 15% each year. Which of the following statements are true? Select all that apply.This function can be represented by the quadratic equation f(x)=0.15(x+60)^2
This situation can be represented by the exponential function f(x)=60 x 1.15^x
This function has no x-intercept
After 4 years the value of the investment will be $120.00
After 6 years the value of the investment will be $653.00
After 7.86 years the value of the investment will be 3 times the initial value
After 8 years the value of the investment will be $184.00

Answers

This function canbe represented by the quadratic equation f(x)=0.15(x+60)^2; This situation can be represented by the exponential function f(x)=60 x 1.15^x;  After 7.86 years the value of the investment will be 3 times the initial value. 
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