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3 years ago

Emily is 4 years older than Grace. When their ages are added together they equal 26. How old is Emily?

Mathematics

1 answer:

Arisa [49]3 years ago

3 0

26-4=22 22/2=11 Emily is 11

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Which value of x satisfies both -9x + 4y = 8 and -3x − y = 4 given the same value of y?

jeka94

Hello there,

The correct answer is C

Here's why,
-9(-8/7)+4y=8 is -4/7

and

-3(-8/7)-y=4 is -4/7

Hope this helps!

5 0

3 years ago

Find the difference. express the answer in scientific notation. (5.29 times 10 superscript 11 baseline) minus (3.86 times 10 sup

Georgia [21]

The difference between (5.29 times 10 superscript 11 baseline) minus (3.86 times 10 superscript 11 baseline) is 1. 43 × 10^11

<h3>How to determine the notation</h3>

Given the expression

(5. 29 × 10^11) - (3. 86 × 10 ^11)

First, find the common factor

10^11 ( 5. 29 - 3. 86)

Then substract the values within the bracket

10^11 (1. 43)

Multiply with the factor, we have

⇒1. 43 × 10^11

Thus, the difference between (5.29 times 10 superscript 11 baseline) minus (3.86 times 10 superscript 11 baseline) is 1. 43 × 10^11

Learn more about index notation here:

brainly.com/question/10339517

#SPJ1

7 0

2 years ago

Use substitution to solve the system of equations.

Katarina [22]

The colution to your problem is a. (3,-6)

5 0

4 years ago

An above swimming pool is leaking after 1/2 hour the pool has leaked 7/8 of a gallon of water

Luden [163]

The answer to your question are <span>1.75</span>

8 0

3 years ago

The director of a state agency believes that the average starting salary for clerical employees in the state is less than $30,00

ss7ja [257]

Answer:

The test statistics is $z = -1$

Step-by-step explanation:

From the question we are told that

The sample size is n = 100

The null hypothesis is $H_o : \mu = \$30000$

The alternative hypothesis is $H_a : \mu < \$ 30000$

The sample mean is $\= x = \$29,750$

The standard deviation is $\sigma = \$2,500$

The level of significance is $\alpha =0.05$

Generally the test statistics is mathematically represented as

$z = \frac{\= x - \mu }{ \frac{ \sigma}{ \sqrt{n} } }$

=> $z = \frac{29750 - 30000 }{ \frac{ 2500}{ \sqrt{100} } }$

=> $z = -1$

7 0

3 years ago