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3 years ago

I rlly hate math, pweaseeee help me asap!!!

Mathematics

1 answer:

jekas [21]3 years ago

6 0

Answer:

See explanation.

Step-by-step explanation:

Part C)

$5+(-10)$

When adding a positive to a negative, the result will be the sign of the larger absolute value. In this case, 10 is greater than 5, so the result will be negative.

Adding a negative is also the same thing as subtracting a positive.

$5+(-10)\\5-10\\-5$

For your second problem, 5 is larger than 3, so the result will be positive.

$5+(-3)\\5-3\\2$

-----

When adding a positive to another positive, the result will be positive.

$5+3\\8$

When adding a number to zero, the answer will always be the number.

$5+0\\5$

Part D)

When multiplying a positive times a negative, the result will always be negative.

$5*(-10)\\-50$

$5*(-3)\\-15$

-----

When multiplying a positive times a positive, the result will always be positive.

$5*10\\50$

When multiplying a positive or a negative times zero, the result will always be zero.

$5*0\\0$

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Justin is asked to solve the following system of linear equations using the elimination method.

romanna [79]

Alright, lets get started.

Justin is asked to solve the linear equations using elimination method.

By using elimination method means we have to multiply some numbers in our given equations in such a way that the co-efficient of x or y become same in both equations so that we could add or subtract them to cancel one of the term either x or y.

So, given equations are :

$5x - 12 = 3$

$-20x + 14 y = 13$

See we have 5x in first equation and -20x in second equation.

So, we try to change 5x into 20 x by multiplying it with 4, both of the equations will have 20 x in common

Lets multiply 4 in first equation

$4 * (5x-12y) = 4 * 3$

$20x - 48y = 12$

Now both equations could be added and 20 x will be cancelled out and we could easily find the value of y then solve for x.

So, Justin should try to change 5 so that it will be cancels, so option B : Answer

Hope it will help :)

3 0

3 years ago

24. 17 is 40% of what number?

EastWind [94]

Answer:

9.7

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Write the standard equation for the circle center (-6,8) that passes through (0,0)

Reil [10]

Answer:

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

here (h, k) = (- 6, - 8), thus

(x + 6)² + (y + 8)² = r²

The radius is the distance from the centre to a point on the circle

Calculate r using the distance formula

r = √ (x₂ - x₁ )² + (y₂ - y₁ )²

with (x₁, y₁ ) = (- 6, - 8) and (x₂, y₂ ) = (0, 0)

r = $\sqrt{(0+6)^2+(0+8)^2}$ = $\sqrt{36+64}$ = $\sqrt{100}$ = 10

Hence

(x + 6)² + (y + 8)² = 100 → D

4 0

3 years ago

. A local electricians union has 540 members. If 65% of the members attended the last meeting, how many members went to the last

Genrish500 [490]

351 members

Multiply .65 by 540 which gives you 351.

8 0

2 years ago

A manufacturer of tires wants to advertise a mileage interval that ex-cludes no more than 10% of the mileage on tires he sells.

Sergio039 [100]

Answer:

This mileage interval is from 30120 miles and higher.

Step-by-step explanation:

Problems of normally distributed samples can be solved using 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 problem, we have that:

All he knows is that, for a large number of tires tested, the mean mileage was 25,000 miles, and the standard deviation was 4000 miles. This means that $\mu = 25000, \sigma = 4000$ .

A manufacturer of tires wants to advertise a mileage interval that ex-cludes no more than 10% of the mileage on tires he sells. What interval wouldyou suggest?

The lower end of this interval is X when Z has a pvalue of 0.90. That is $Z = 1.28$ .

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

$1.28 = \frac{X - 25000}{4000}$

$X - 25000 = 4000*1.28$

$X = 30120$

This mileage interval is from 30120 miles and higher.

7 0

3 years ago