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3 years ago

I need help Please!

Mathematics

2 answers:

goldenfox [79]3 years ago

8 0

Answer:

To solve, use a simple one-step equation

Known: Number of coins; Number of Nickles.

Unknown: Number of Dimes.

a) To find the number of Dimes

b) Use x (or virtually any letter) to represent the unknown number of dimes

c) 9+x=13

d) Subtract 9 from both sides to cancel out the 9 and isolate the variable on one side. x=4

e) 9+4=13, so yes, the answer is correct

Jet001 [13]3 years ago

7 0

A. How many dimes is there out of the 13 coins.
B. D= dimes
C. 9+d=13
D. 9+d=13
Subtract 9 from 13
13-9=4
D=4
9+4=13

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Select the best possible first step to solving the system by first eliminating the x variable. 3x − 9y = 6 2x − 11y = 6

Klio2033 [76]

The first step would be to add 3x and 2x i believe but I am not sure

5 0

3 years ago

Solve to find the value for x in the linear equation: 3(−4x + 5) = 12.

gtnhenbr [62]

Answer:

x=4

Step-by-step explanation:

3(-4x+5)=12

3(-4x) + 3(5)=12

-12x+15=12

-15=-15

-12x=-3

-x = -4

Since your x is negative change the signs

8 0

3 years ago

Read 2 more answers

Mark currently works part-time with a salary of $8,000 per year. mark plans to quit working and attend college for 4 years. if h

BARSIC [14]

For the answer to the question above asking how long will it take a mark to recover his investment assuming he has a salary of $32,000 upon graduating?

The answer is Mark will lose:
4 * $ 8,000 = $32,000 ( without salary ) + $64,000 ( college costs ) =
= $96,000 in total
$96,000 : $32,000 = 3
Answer:
It will take Mark 3 years to recover his investments. Poor Mark

6 0

3 years ago

Megan went to the beach 34 times last summer. She went 6 more times in July than she did in June. She went twice as many times i

Irina-Kira [14]

Megan went to beach 34 times last summer.
June = x
July = 6 * june
August = 2 * june
Thus Let’s find the value of june, which is the value of x as a variable:
Equation:
x + 6x + 2x = 34
Solution:
=> x + 6x + 2x = 34
=> 9x = 34
=> 9x / 9 = 34 / 9
=> x = 3.7778, since this is a decimal, let’s round this off to 3.78
Let’s check our answer
=> 4 + 6(4) + 2(4)
=> 4 + 24 + 8
=> 36 approximately.

4 0

3 years ago

Historically, the proportion of students entering a university who finished in 4 years or less was 63%. To test whether this pro

Neporo4naja [7]

Answer:

z(c) = - 1,64

We reject the null hypothesis

Step-by-step explanation:

We need to solve a proportion test ( one tail-test ) left test

Normal distribution

p₀ = 63 %

proportion size p = 51 %

sample size n = 114

At 5% level of significance α = 0,05, and with this value we find in z- table z score of z(c) = 1,64 ( critical value )

Test of proportion:

H₀ Null Hypothesis p = p₀

Hₐ Alternate Hypothesis p < p₀

We now compute z(s) as:

z(s) = ( p - p₀ ) / √ p₀q₀/n

z(s) =( 0,51 - 0,63) / √0,63*0,37/114

z(s) = - 0,12 / 0,045

z(s) = - 2,66

We compare z(s) and z(c)

z(s) < z(c) - 2,66 < -1,64

Therefore as z(s) < z(c) z(s) is in the rejection zone we reject the null hypothesis

5 0

4 years ago