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2 years ago

I need the answers to these math problems

Mathematics

2 answers:

Sergio039 [100]2 years ago

6 0

6. 6•2-1 = 12-1 = 11
9+2 = 11 11 = 1

7. 9•[8-2-3-(9-8)] 9-8 = 1
8-2-3 = 3 • 9 = 27+1 = 28

8. [7•3-(6+9)]/2= 6+9= 15
7•3 = 21 /2 = 10.5

9. 2•10/5+(7+5)/2= 7+5=12
2•10 = 20/2 = 10+12 = 22

10. 2•6-9-[5-(9-7)] 9-7 = 2
5-2 = 3
2•6= 12-9+3 = 3+3=6

11. 10+10/5-8 = 10/5 = 2
10-8+2= 2+2=4

12. [2-(10-8)]•6+3•5 = 10-8=2
2-2= 0 • 6 = 0+3•5 =15

13. 8/2/(6-4) = 6-4 = 2
8/2/2 = 4/2=2

14. 6[5+(14-8)/3] = 14-8=6 = 5+6/3= 2+5= 7•6 = 42

make sure you always use PEMDAS! those brackets are important too. once you do the problem inside the parentheses you go straight to the problem inside the bracket then move further on. please make brainliest :)!!

mafiozo [28]2 years ago

3 0

5# 25-(2×10)=25-20=5. 7# 9×(8-2-3-1)=9×2=18. 8# (7×3-15)÷2=(21-15)÷2=6÷2=3. 9# 2×10÷5+12÷2=20÷5+12÷2=4+6=10. 10# 2×6-9-(5-2)=2×6-9-3=12-9-3=3-3=0. 11# 10+2-8=12-8=4

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Please help solve for x..

aalyn [17]

Answer:

x = 1 or x = -1

Step-by-step explanation:

Given equation:

$x^{100}-4^x \cdot x^{98}-x^2+4^x=0$

Factor out -1:

$\implies -1(-x^{100}+4^x \cdot x^{98}+x^2-4^x)=0$

Divide both sides by -1:

$\implies -x^{100}+4^x \cdot x^{98}+x^2-4^x=0$

Rearrange the terms:

$\implies 4^x \cdot x^{98}-4^x-x^{100}+x^2=0$

$\textsf{Apply exponent rule} \quad a^{b+c}=a^b \cdot a^c \quad \textsf{to }x^{100}:$

$\implies 4^x \cdot x^{98}-4^x-x^{98}x^2+x^2=0$

Factor the first two terms and the last two terms separately:

$\implies 4^x(x^{98}-1)-x^2(x^{98}-1)=0$

Factor out the common term $(x^{98}-1)$ :

$\implies (4^x-x^2)(x^{98}-1)=0$

<u>Zero Product Property</u>: If a ⋅ b = 0 then either a = 0 or b = 0 (or both).

Using the <u>Zero Product Property</u>, set each factor equal to zero and solve for x (if possible):

$\begin{aligned}x^{98}-1 & = 0 & \quad \textsf{or} \quad \quad4^x-x^2 & = 0 \\x^{98} & =1 & 4^x & = x^2 \\x & = 1, -1 & \textsf{no}& \textsf{ solutions for } x \in \mathbb{R}\end{aligned}$

Therefore, the solutions to the given equation are: x = 1 or x = -1

Learn more here:

brainly.com/question/27751281

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1 year ago

John has $220 in his account and adds $25 to it each month. Cheryl has $100 in her account and adds $35 each month to her accoun

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Answer:

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Step-by-step explanation:

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2 years ago

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Which of the following angles are supplementary to angle a? Select all that apply.

GuDViN [60]

Answer:

c is the supplement angle

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2 years ago

sue stacked one box onto another. the bottom had the height of 2 1/3 feet and the top box had the height of 3 2/3 feet. how tall

Scilla [17]

Height of bottom box : - $2 \frac{1}{3} => 7/3$
Height of top box : - $3 \frac{2}{3} => 11/3$

Thus, height of two boxes =

$\frac{7}{3} + \frac{11}{3} = \frac{18}{3} => 6ft$

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A professor gives her 100 students an exam; scores are normally distributed. The section has an average exam score of 80 with a

frozen [14]

Answer:

6.18% of the class has an exam score of A- or higher.

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

$\mu = 80, \sigma = 6.5$