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3 years ago

I have tried different attempts but still can’t solve it

Mathematics

1 answer:

zloy xaker [14]3 years ago

5 0

Hello!

First you to do 65 * 0.20

0.20 is 20% as a decimal

65 * 0.20 = 13

$13 is how much John saves.

To find out how much the skateboard cost you subtract how much he saved by the cost of the skateboard

65 - 13 = 52

The skateboard cost $52

Hope this helps!

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Lisa [10]

Answer:

B. 200 doses

Step-by-step explanation:

Given,

1 dose is required for 100 mg,

Since, 1 mg = 0.001 g,

⇒ 100 mg = 0.1 g

⇒ 1 dost is required for 0.1 g,

Thus, the ratio of doses and quantity ( in gram ) is $\frac{1}{0.1}=10$

Let x be the doses required for 20 grams,

So, the ratio of doses and quantity is $\frac{x}{20}$

$\implies \frac{x}{20}=10$

$\implies x=200$

Hence, 200 doses can be obtained from 20 grams of the drug.

Option 'B' is correct.

8 0

3 years ago

if alpha and beta are the zeros of the quadratic polynomial FX = x square - 5 x + 4 find the value of one by alpha + 1 by beta-2

Kryger [21]

Answer:

suggestions use math scanner or mathaway or algebra calculator they will provide the steps and answer

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3 years ago

What's the inequality for 15x + 21 ≥ 120

Andrei [34K]

X>= 6.6 is your answer

5 0

3 years ago

Given the function f (x) = x² + 8x + 7, what are the zeros of f?

lutik1710 [3]

Answer:

x = - 7, x = - 1

Step-by-step explanation:

To find the zeros let f(x) = 0 , that is

x² + 8x + 7 = 0

Consider the factors of the constant term (+ 7) which sum to give the coefficient of the x- term (+ 8)

The factors are + 7 and + 1 , since

7 × 1 = + 7 and 7 + 1 = + 8 , then

x² + 8x + 7 = 0

(x + 7)(x + 1) = 0 ← in factored form

Equate each factor to zero and solve for x

x + 7 = 0 ⇒ x = - 7

x + 1 = 0 ⇒ x = - 1

4 0

3 years ago

If f(x) = 5x - 1, then f^-1(x)=

lesantik [10]

F(-1)=5(-1)-1
-5-1
-6
Your answer is-6

7 0

3 years ago

Read 2 more answers