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3 years ago

Please help me i dont know it .

Mathematics

1 answer:

notka56 [123]3 years ago

5 0

Answer:

Step-by-step explanation:

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I have 25 coins in my pocket all of which are 5 penny or 20 penny coins. if their total value is 2.90 pounds how many penny coin

Jlenok [28]

Answer:

14 coins of 5p
11 coins of 20p

Step-by-step explanation:

Given

5p coins = x
20p coins = y
Total = 2.90 = 290 p
Number of coins = 25

Equations

x + y = 25
5x + 20y = 290 ⇒ x + 4y = 58

Consider the first equation in the second one

x + y + 3y = 58
25 + 3y = 58
3y = 33
y = 11

Then x is

x = 25 - 11 = 14

Answer

14 off 5p coins and 11 off 20p coins

3 0

3 years ago

What’s the domain of the function y=-2(2)x+2?

Vlad1618 [11]

Answer:

Domain: -infinity < x < infinity

Step-by-step explanation:

This function has no undefined points or constraints.

8 0

3 years ago

How are the slope formula and finding slope using rise over sun related?

Vladimir [108]

Answer:They are practically the same thing the only difference is you use the formula when you have coordinates and rise over run when you have the graph

Step-by-step explanation:

6 0

3 years ago

Solve the system of equations using substitution 4x + 2y = 16 =−12+5

mario62 [17]

Answer:

$x=\frac{70}{11},\:y=\frac{20}{11}$

Step-by-step explanation:

$\begin{bmatrix}4x+2y=16y\\ y=-\frac{1}{2}x+5\end{bmatrix}$

$\mathrm{Substitute\:}y=-\frac{1}{2}x+5$

$\begin{bmatrix}4x+2\left(-\frac{1}{2}x+5\right)=16\left(-\frac{1}{2}x+5\right)\end{bmatrix}$

$Simplify$

$\begin{bmatrix}3x+10=16\left(-\frac{1}{2}x+5\right)\end{bmatrix}$

Isolate x for 3x+10=16(-1/2x+5): $x=\frac{70}{11}$

$\mathrm{For\:}y=-\frac{1}{2}x+5$

$\mathrm{Substitute\:}x=\frac{70}{11}$

$y=-\frac{1}{2}\cdot \frac{70}{11}+5$

$-\frac{1}{2}*\frac{70}{11}+5=\frac{20}{11}$

$y=\frac{20}{11}$

$\mathrm{The\:solutions\:to\:the\:system\:of\:equations\:are:}$

$x=\frac{70}{11},\:y=\frac{20}{11}$

3 0

3 years ago

You chose a college loan plan that is compounded annually. You take out $10,000 on the loan, and it has an interest rate of 5.75

Whitepunk [10]

Answer:

At the end of 6 years, he would have paid $13985.6

Step-by-step explanation:

Initial amount taken as load is $10,000 This means that the principal

P = 10000

It was compounded annually. This means that it was cam pounded once in a year. So

n = 1

The rate at which the principal was compounded is 5.75%. So

r = 5.75/100 = 0.0575

it takes you six years to pay off the loan. So

t = 6

The formula for compound interest is

A = P(1+r/n)^nt

A = total amount of money that you would have paid back by the end of the six years. Therefore

A = 10000 (1+0.0575/1)^1×6

A = 10000(1.0575)^6 = $13985.6

5 0

3 years ago