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2 years ago

Find the value of the expression if x=-7

Mathematics

1 answer:

LUCKY_DIMON [66]2 years ago

5 0

Answer: -16

Step-by-step explanation:

49 would be the result of -7 squared. Due to the fact it is negative, it would cancel out to be positive.

For the numerator, 49-1 is equivalent to 48.

48/x+4

-7+4 = -3

48/-3

= -16

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If 40% of a number is 80 what is 25% of that number?

olga2289 [7]

Answer:

25% of 200 is 50

Step-by-step explanation

40% of a number is 80

.40 * n = 80

Divide each side by .4

.40 n/.4 = 80/.4

n = 200

The number is 200

Now lets find 25 percent of that number

.25 * 200 = 50

7 0

3 years ago

Find the original price of a pair of shoes if the sale price is $20 after a 50% discount.

MrMuchimi

The Original Price is $40

Explanation:
50 1 20
—- = — Which means ——
100 2 40

7 0

2 years ago

Write an expression that, when simplified is equivalent to 15x +7

cupoosta [38]

Answer:

2(7.5x+3.5)

Step-by-step explanation:

I can't remember what these equations are actually called, however in order to solve this you simply multiply 7.5 by 2, and then 3.5 by 2.

4 0

3 years ago

Make n the subject of the formula

kogti [31]

Answer:

$\mathsf{ \frac{m + 21}{5} = n }$

Step-by-step explanation:

To make "n" the subject of the formula, rearrange the formula so it begins with " n = "

To isolate the variable "n", you need to inverse the other terms on that side of the equation where "n" really is.

=> m = 5n - 21

there's a "-21" next to "5n", inverse of subtraction is addition, so add 21 on both sides of the equation.

=> m + 21 = 5n - 21 + 21

=> m+ 21 = 5n

There's also a 5 attached to n, that means the multiplication of n with 5, the inverse of multiplication is division, so dividing both sides of the equation by 5

$\mathsf{ \frac{m + 21}{5} = n }$

3 0

2 years ago

Make U the subject of the formular S=½(u+v)t

kirill [66]

Answer:

$U = \frac{2S}{t} - v$

Step-by-step explanation:

$S = \frac{1}{2} (u+v)t$

Divide S by 1/2

$2S = t(u+v)$

Divide 2S by t

$\frac{2S}{t} =u + v$

Subtract v

$U = \frac{2S}{t} - v$

5 0

2 years ago