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3 years ago

Represent the following algebraically. A number, x, decreased by the sum of 2x and 5

Mathematics

1 answer:

sashaice [31]3 years ago

8 0

The answer is x-(2x+5)

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A restaurant bought 5 pounds of salmon for $42.50. How much would 7 pounds of salmon cost? *

Elanso [62]

Answer:

59.5

Step-by-step explanation:

42.50/5=8.5

1 lb=8.5

7lb=7*8.5=59.5

7 0

3 years ago

[Exponential] |x|-2|-1|0|1|2| |y|2/9|2/3|2|6|18| When the x-value increases by 1, the y-value ________ (b-value)

dimaraw [331]

Answer:

$b = 3$

The value of y triples

Step-by-step explanation:

Given:

$\begin{array}{cccccc}x & {-2} & {-1} & {0} & {1} & {2} \ \\ y & {\frac{2}{9}} & {\frac{2}{3}} & {2} & {6} & {18} \ \end{array}$

Required

Determine b value

An exponential equation is:

$y = ab^x$

When $x = 0; y =2$

So:

$y = ab^x$

$2 = a * b^0$

$2 = a$

$a = 2$

When $x = 2; y = 18$

So:

$18 = a * b^2$

Substitute 2 for a

$18 = 2 * b^2$

Divide by 2

$9 = b^2$

Take positive square roots of both sides

$3 = b$

$b = 3$

5 0

2 years ago

A square playground is surrounded by a sidewalk on all sides. The sidewalk is 2n+3 yards along each side. The sidewalk is 0.5 ya

soldi70 [24.7K]

Answer: It can be calculated by using the formula of perimeter and by adding four sides

1) Perimeter= 2(L+B)= 8n+12

2) Perimeter= L+L+L+L= 4L= 8n+12

Step-by-step explanation:

As it is a square playground all its sides are equal

Perimeter of the sidewalk = 2(L+B)= 2(2n+3+0.5)= 2(2n+3.5)= 4n+7

Perimeter of the square playground= 2(L+B)= 2(2n+3+2n+3)

2(4n+6)= 8n+12-------------------------A

Perimeter of the square playground= L+L+L+L=4L 42n+3+2n+3+2n+3+2n+3=4(2n+3)= 8n+12------------------------B

4 0

3 years ago

Simplify.

Deffense [45]

Step-by-step explanation:

$( \frac{3}{2} ) ^{2} + 4 \div 2 - 3 \\ \frac{9}{4} + 4 \div 2 - 3 \\ \frac{9}{4} + 2 - 3 \\ \frac{9}{4} - 1 \\ \frac{9 - 4}{4} \\ \frac{5}{4}$

5 0

2 years ago

Read 2 more answers

Evaluate if a = 28 and b = -3. a 4 + b = [?]

SVEN [57.7K]

Answer:

109

Step-by-step explanation:

(4)28+(-3)

4*28=112

112+(-3)

112-3

109

Hope this helps, LMK if its right

4 0

2 years ago