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2 years ago

-10x+45 find x when x =15

Mathematics

2 answers:

zepelin [54]2 years ago

5 0

Answer:

Step-by-step explanation:

-10(15)+45

-150 plus 45

-105 would be your answer

leonid [27]2 years ago

3 0

Your answer is -105 pal

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The sum of two numbers is "-1" One number is 12 more than the other one. Find the numbers.

ruslelena [56]

Answer:

x = 5.5

y = - 6.5

Step-by-step explanation:

Let one of the numbers = x

Let the other number = y

x + y = - 1

x = y + 12 Put the second equation into the first one

y + 12 + y = - 1 Subtract 12 from both sides

y + y = - 1 - 12 Combine both left and right sides

2y = - 13 Divide by 2

2y/2 = - 13/1

y = - 6.5

x + y = - 1

x - 6.5 = - 1 Add 6.5 to both sides

x = 5.5

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Answer:

Is that Deltamath?

Step-by-step explanation:

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Assume that the mean length of a human pregnancy is 269 days. If 95% of all human pregnancies last between 249 and 289 days, w

o-na [289]

Answer:93% not sure

Step-by-step explanation:

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2 years ago

What is the value of 5n-3 when n=5?

joja [24]

Answer:

Step-by-step explanation:

We are given the expression:—

$\displaystyle \large{5n-3}$

When n = 5, substitute/change n to 5:—

$\displaystyle \large{5(5)-3}$

Evaluate:—

$\displaystyle \large{25-3=\boxed{22}}$

__________________________________________________________

<u>Summary</u>

<u>Substitution</u>

Changing or replacing from a term to another terms/expression is called substitution.

Examples:—

If we are given the expression $\displaystyle \large{2y-1}$ and we want to find the value when y = 4, simply replace y-term to 4.

$\displaystyle \large{2(4)-1=8-1=\boxed{7}}$

__________________________________________________________

If you have any doubts regarding my answer/explanation, do not hesitate to ask in comment!

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1 year ago

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Likurg_2 [28]

Answer:

Step-by-step explanation:

90/5=18

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2 years ago