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3 years ago

13

Anna's math test grade was 7 points less than her science test grade. The average grade was 91.5%. What did she get on each test

?

1 answer:

denis23 [38]3 years ago

6 0

Answer:

84.5%

Step-by-step explanation:

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Betsy can clean a b of the house in an hour. How long will it take her to clean the whole house?

kipiarov [429]

Answer:

$\frac{b}{a}$ is the total time taken to clean the house.

Step-by-step explanation:

Given that:

Betsy cleans $\frac{a}{b}$ of the house.

Time taken = 1 hour

To find:

Time taken to clean the whole house = ?

Solution:

We can use unitary method here to solve this problem.

We are given that $\frac{a}{b}$ of the house is cleaned in 1 hour.

We have to find that a total of 1 house will be cleaned in how much time.

(1 house because Betsy's house can be considered as a single unit).

To find this we will divide 1 hour with $\frac{a}{b}$ .

Now, Let us solve this mathematically:

$\frac{a}{b}$ of the house is cleaned in = 1 hour

1 of the house will be cleaned in = 1 hour divided by $\frac{a}{b}$

$\dfrac{1}{\dfrac{a}{b}}\ hours\\\Rightarrow \dfrac{1 \times b}{a}\ hours\\\Rightarrow \dfrac{b}{a}\ hours$

So, the <em>answer </em>is:

$\frac{b}{a}$ is the total time taken to clean the house.

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4 years ago

Use natural logarithms to solve the equation 9e 4x = 54 forx. Give the exact solution and an approximate

GuDViN [60]

Answer:

.448

Step-by-step explanation:

$9e^{4x} = 54 \\e^{4x} = 54/9\\e^{4x} = 6\\ln{6} = 4x\\ln{6}/4 = x\\.448 =x\\(approx)$

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3 years ago

Someone help me plz!!!!!!!

Ivenika [448]

Answer:

c part is the answer of this question

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3 years ago

Read 2 more answers

25% of 400 is equal to 20% of What?

Bess [88]

Here is your answer:

First find 25% of 400:

400/x=100/25
(400/x)*x=
(100/25)*x
x 400=4*
400/4=x
100=x
x=100

The answer is "500."

100 ÷ 20%
100 ÷ (20 ÷ 100) =
(100 × 100) ÷ 20 =
10,000 ÷ 20 =
= 500

Hope this helps!

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3 years ago

Write an equation to represent the following statement.

Scilla [17]

Answer:

J is 12

Step-by-step explanation:

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3 years ago