3 years ago

Helppppppppppppp meeee plsssssss.

Mathematics

2 answers:

maria [59]3 years ago

7 0

Answer:

Step-by-step explanation:

riadik2000 [5.3K]3 years ago

6 0

Answer:

Im not sure but I think its x=3

Step-by-step explanation:

tell me if wrong. Ill do my best to get it right :)

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The football team has a total of 20 jerseys. There are 4 medium-sized jerseys. What percent of the jerseys are medium-sized jers

DanielleElmas [232]

20%

Because Suppose x% of 20 is 4

That is
x100×20=4
or
x5=4

—> =4×5=20

So 20% of 20 is 4

8 0

3 years ago

Read 2 more answers

A 41 gram sample of a substance that's used to detect explosives has a k-value of 0.1392. Find the substance's half life, in day

-BARSIC- [3]

Answer:

The substance half-life is of 4.98 days.

Step-by-step explanation:

Equation for an amount of a decaying substance:

The equation for the amount of a substance that decay exponentially has the following format:

$A(t) = A(0)e^{-kt}$

In which k is the decay rate, as a decimal.

k-value of 0.1392.

This means that:

$A(t) = A(0)e^{-0.1392t}$

Find the substance's half life, in days.

This is t for which $A(t) = 0.5A(0)$ . So

$A(t) = A(0)e^{-0.1392t}$

$0.5A(0) = A(0)e^{-0.1392t}$

$e^{-0.1392t} = 0.5$

$\ln{e^{-0.1392t}} = \ln{0.5}$

$-0.1392t = \ln{0.5}$

$t = -\frac{\ln{0.5}}{0.1392}$

$t = 4.98$

The substance half-life is of 4.98 days.

5 0

2 years ago

Please help, I will give you brainliest!

V125BC [204]

Answer:

$12 = 12 \\ 12 - 12 = 12 - 12 \\ 0 = 0$

7 0

2 years ago

Brendan has 33 coins in his pocket, all of which are dimes and quarters. if the total value of his change is 615 cents, how many

Amanda [17]

If all were dimes, the value would be $3.30. Brendan has $2.85 more than that. Each quarter that replaces a dime increases the value by $0.15, so Brendan must have $2.85/$0.15 = 19 quarters.

Brendan has 14 dimes and 19 quarters.

6 0

2 years ago

Look at the pic and please help do only number 3 please

Effectus [21]

They must have the same solution because they are doubled from eachother

5 0

2 years ago